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Gunold Poly to Floriani thread conversion chart

Every Gunold POLY 40 color with its closest Floriani Polyester equivalent, a rating for how close it is and two runner-up options. There are 300 rows. Click any number for the full breakdown.

11%very close or better
61%close or better
300Gunold POLY 40 colors
286Floriani Polyester colors

Reverse: Floriani → Gunold Poly Convert a design's list Shop Floriani ↗

300 colors
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Gunold POLY 40Floriani PolyesterMatchAlternatives
61001Bright White→730Off WhiteClose ΔE 2.6 850 801
61351Pure White→730Off WhiteClose ΔE 2.6 850 801
61350Polar White→730Off WhiteClose ΔE 2.6 850 801
61002Soft White→101Pale PinkVery close ΔE 1.7 730 850
61061Pale Yellow→521CornsilkClose ΔE 4.3 734 721
61066Primrose→521CornsilkClose ΔE 2.4 721 501
61167Maize Yellow→560Vegas GoldClose ΔE 4.0 501 522
61369Egg Yolk→523GoldenrodClose ΔE 2.8 502 561
61135Pastel Yellow→560Vegas GoldVery close ΔE 2.2 522 501
61067Lemon Yellow→542CockatooClose ΔE 2.9 501 521
61365Bright Yellow→544Amber YellowClose ΔE 3.7 546 560
61187Mimosa Yellow→544Amber YellowClose ΔE 3.1 546 560
61023Yellow→544Amber YellowVery close ΔE 1.2 546 522
61456Caribbean Yellow→544Amber YellowClose ΔE 2.9 546 560
61124Sun Yellow→523GoldenrodClose ΔE 4.2 561 502
61185Golden Yellow→524Old Athletic GoldClose ΔE 4.6 533 561
61083Spark Gold→523GoldenrodVery close ΔE 1.6 502 532
61368Curry Powder→711Inca GoldClose ΔE 4.6 562 753
61025Mine Gold→711Inca GoldClose ΔE 4.5 753 562
61373Dark Amber→562Walnut TaffyClose ΔE 4.3 525 753
61070Gold→751Sweet MelonNear identical ΔE 0.6 752 502
61374Butcher Block→564BranApproximate ΔE 5.6 844 563
61364Light Sepia→844African SafariApproximate ΔE 7.6 564 210
61159Temple Gold→283Green GoldApproximate ΔE 5.9 284 735
61359Light Yellow→283Green GoldApproximate ΔE 5.7 544 560
61361Light Olive→214BasilClose ΔE 4.5 285 844
61209Light Avocado→842Willow LeafVery close ΔE 1.6 813 421
61022Cream→811Angora WhiteClose ΔE 3.1 731 540
61378Pale Ecru→811Angora WhiteApproximate ΔE 6.2 421 411
61476Vanilla→811Angora WhiteClose ΔE 4.8 421 733
61508Putty→451Light TaupeApproximate ΔE 8.2 452 794
61211Light Khaki→452TaupeApproximate ΔE 8.7 413 423
61212Khaki→413Old SilverApproximate ΔE 6.6 452 844
61362Medium Olive→218Maui GreenClose ΔE 3.4 2015 415
61173Medium Army Green→737Indian SpiceApproximate ΔE 8.1 452 745
61156Light Army Green→2015Pation GreenClose ΔE 4.7 218 277
61363Dark Olive→415WestpointClose ΔE 3.9 453 486
61455Mud Brown→749MahoganyVery close ΔE 1.6 739 489
61371Camo Brown→739ClevelandApproximate ΔE 7.0 565 218
61360Deep Gold Green→565HarvestApproximate ΔE 5.2 745 737
61384Red Brass→796Provincial RosePoor match ΔE 10.2 565 769
61383Yellow Ochre→745Harvest BrownApproximate ΔE 5.6 785 713
61381Ochre→785Sienna BrownClose ΔE 3.7 786 713
61126Tan→753Orange PeelClose ΔE 4.2 711 534
61375Light Caramel→564BranApproximate ΔE 8.0 711 563
61055Tawny Tan→741Pottery BuffClose ΔE 2.7 751 752
61376Light Tawny→743Old World BuffNear identical ΔE 1.0 753 503
61149Deep Ecru→783Sahara TanApproximate ΔE 5.0 743 741
61472Light Ecru→723BirchClose ΔE 4.5 815 735
61218Silver Gray→411Palm LeafPoor match ΔE 10.5 116 451
61366Greige→422Lime GrayApproximate ΔE 7.9 423 815
61470Light Umber→452TaupeApproximate ΔE 8.4 844 413
61379Medium Khaki→413Old SilverClose ΔE 4.6 423 844
61180Medium Taupe→452TaupeApproximate ΔE 6.9 632 794
61372Beige→422Lime GrayApproximate ΔE 5.0 723 815
61462Light Beige→411Palm LeafApproximate ΔE 8.3 792 451
61389Mocha→743Old World BuffApproximate ΔE 7.4 422 451
61127Medium Ecru→111Light PeachApproximate ΔE 7.4 421 792
61082Ecru→811Angora WhiteApproximate ΔE 5.6 111 1021
61071Off White→731SandstoneClose ΔE 4.9 811 1021
61474White→411Palm LeafApproximate ΔE 5.4 483 813
61086Beach Sand→731SandstoneVery close ΔE 1.9 811 800
61063Pale Yellow→731SandstoneClose ΔE 3.3 800 811
61453Light Mint Green→229LimeApproximate ΔE 7.6 244 201
61100Light Grass Green→244CeleryClose ΔE 4.2 252 243
61047Mint Green→244CeleryClose ΔE 4.7 252 236
61104Pastel Yellow→236Ashen GreenClose ΔE 4.5 244 842
61177Avocado→2011Light OliveClose ΔE 4.2 275 236
61510Lime Green→228Cape GreenApproximate ΔE 6.2 273 275
61452Spring Green→245Woodland GreenClose ΔE 4.8 238 232
61049Grass Green→245Woodland GreenClose ΔE 3.1 231 262
61176Medium Dark Avocado→2015Pation GreenApproximate ΔE 5.9 277 214
61175Dark Avocado→2015Pation GreenApproximate ΔE 6.6 277 248
61454Dark Green→206Wreath GreenApproximate ΔE 6.7 416 257
61174Dark Pine Green→206Wreath GreenApproximate ΔE 7.7 205 265
61103Dark Khaki→749MahoganyClose ΔE 2.9 489 739
61475Pale Celadon→485GrayPoor match ΔE 10.8 452 451
61236Light Silver→101Pale PinkClose ΔE 4.1 123 116
61085Silver→1021BuffApproximate ΔE 6.1 116 111
61380Pale Brown→453Dark TaupeApproximate ΔE 7.1 452 632
61370Umber→453Dark TaupeApproximate ΔE 7.0 796 749
61179Dark Taupe→632Grape IceClose ΔE 5.0 1602 452
61388Afterglow→632Grape IceApproximate ΔE 9.2 453 1603
61128Dark Ecru→794Flagstone ClayClose ΔE 3.2 737 745
61377Iced Coffee→796Provincial RoseApproximate ΔE 5.8 745 713
61463Beaver Brown→565HarvestApproximate ΔE 6.8 745 737
61170Light Brown→796Provincial RoseClose ΔE 3.1 769 713
61385Russet→749MahoganyApproximate ΔE 6.6 198 715
61130Dark Brown→198WineClose ΔE 4.1 715 796
61382Sienna→737Indian SpiceVery close ΔE 1.9 745 844
61056Medium Tawny Tan→767Muted SpiceVery close ΔE 1.8 784 516
61158Dark Maple→713Antique BronzeClose ΔE 3.5 769 796
61391Tuscan Red→713Antique BronzeVery close ΔE 2.1 786 738
61058Tawny Brown→715JamocaClose ΔE 5.0 796 198
61057Dark Tawny Tan→769Dark CinnamonClose ΔE 2.4 715 796
61386Burnt Umber→198WineApproximate ΔE 5.2 1910 715
61473Roasted Coffee→749MahoganyApproximate ΔE 6.7 739 796
61129Brown→198WineVery close ΔE 1.7 715 196
61059Dark Tawny Brown→453Dark TaupeClose ΔE 4.0 486 749
61397Brown Sugar→749MahoganyClose ΔE 3.5 739 489
61131Cloister Brown→486Slate GrayClose ΔE 3.9 453 488
61387Light Apricot→792Shasta PinkClose ΔE 4.2 180 741
61258Coral Reed→180Pink FleshClose ΔE 4.1 792 111
61017Pastel Peach→792Shasta PinkApproximate ΔE 5.2 111 180
61021Maple→1051Singapore SunsetClose ΔE 4.3 702 700
61390Medium Rust→190ScarletClose ΔE 3.2 192 194
61181Rust→1086RaspberryClose ΔE 3.9 1051 190
61457Fireworks Orange→711Inca GoldClose ΔE 3.6 534 512
61168True Orange→534PumpkinClose ΔE 3.0 512 503
61065Orange Yellow→562Walnut TaffyClose ΔE 4.5 525 753
61137Yellow Orange→561Lion ManeClose ΔE 3.2 524 523
61367Amber→562Walnut TaffyClose ΔE 3.0 753 525
61024Goldenrod→524Old Athletic GoldClose ΔE 3.1 561 533
61078Tangerine→534PumpkinClose ΔE 4.2 512 535
61184Orange Red→537CarrotClose ΔE 3.1 526 755
61392Internat'l Orange→700Mars RedVery close ΔE 2.3 702 1053
61037Light Red→700Mars RedVery close ΔE 2.3 702 1053
61393Bright Red→1051Singapore SunsetClose ΔE 3.4 702 700
61395Stop Sign Red→190ScarletClose ΔE 3.4 786 1086
61398Firecracker Red→190ScarletClose ΔE 4.8 1086 1051
61039True Red→1086RaspberryClose ΔE 4.3 1051 190
61147Christmas Red→190ScarletClose ΔE 4.4 1086 1051
61169Bayberry Red→715JamocaClose ΔE 2.6 194 196
61401Maroon Red→194BurgundyClose ΔE 4.2 769 192
61458Ruby Red→192Deep RustVery close ΔE 2.1 194 190
61399Dark Lipstick Red→192Deep RustClose ΔE 3.4 194 769
61400Carmine Red→715JamocaClose ΔE 4.7 769 194
61035Dark Burgundy→198WineClose ΔE 2.4 715 1910
61402Claret→769Dark CinnamonApproximate ΔE 5.0 796 715
61036Cordovan→196Old RoseleafApproximate ΔE 5.1 167 1586
61594Light Cordovan→769Dark CinnamonClose ΔE 4.6 715 194
61054Medium Dark Ecru→792Shasta PinkVery close ΔE 1.5 180 783
61477Light Blush→792Shasta PinkClose ΔE 3.5 741 180
61394Blush→141CoralApproximate ΔE 6.7 1082 1600
61019Peach→141CoralVery close ΔE 1.8 182 1600
61259Salmon Peach→182Misty MaizeClose ΔE 2.3 143 141
61020Dark Peach→182Misty MaizeVery close ΔE 1.5 143 1600
61081Brick→1904Pansies PerfectionsClose ΔE 2.5 165 1602
61034Burgundy→1603Dark MulberryClose ΔE 4.0 1908 135
61190Medium Burgundy→137FandangoApproximate ΔE 5.4 1603 1910
61406Light Beaujolais→1603Dark MulberryClose ΔE 4.8 1910 1908
61405Beaujolais→198WineClose ΔE 2.3 1910 196
61407Red Violet→1910PaterninaClose ΔE 2.9 654 198
61119Dark Mauve→105Laurel PinkClose ΔE 4.3 601 127
61403Light Burgundy→104RosettaClose ΔE 3.9 125 653
61117Mauve→117Misty PinkClose ΔE 2.9 1900 1081
61115Light Pink→1081Pink RoseClose ΔE 3.1 1900 102
61225Pastel Pink→102Light PinkApproximate ΔE 6.1 131 123
61408Pale Blush→102Light PinkClose ΔE 4.7 123 131
61121Pink→131Light LilacApproximate ΔE 6.5 103 125
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Gunold POLY 40Floriani PolyesterMatchAlternatives
61108Light Mauve→125Bright PinkApproximate ΔE 5.4 103 104
61410Medium Pink→601ZephyrClose ΔE 4.4 133 653
61224Bright Pink→125Bright PinkApproximate ΔE 5.6 104 103
61109Hot Pink→127Hot PinkApproximate ΔE 6.0 128 105
61533Light Rose→129Deep PinkApproximate ΔE 5.3 110 Y40
61231Medium Rose→127Hot PinkClose ΔE 3.2 128 105
61511Deep Rose→105Laurel PinkClose ΔE 4.7 127 128
61404Ultra Pink→110Pale PeachVery close ΔE 1.9 Y40 128
61154Coral→104RosettaVery close ΔE 2.0 125 1082
61396Bubblegum→104RosettaClose ΔE 3.4 1902 1119
61148Light Coral→103PinkClose ΔE 2.6 125 1082
61015Medium Peach→1011Rose CarolinaVery close ΔE 1.9 140 1081
61064Pale Peach→102Light PinkClose ΔE 4.0 123 131
61113Pastel Mauve→123Pink MistClose ΔE 4.2 116 102
61068Pink Tint→116Peach BlossomVery close ΔE 2.2 101 1021
61120Pale Pink→116Peach BlossomClose ΔE 2.4 101 1021
61111Pastel Orchid→131Light LilacClose ΔE 4.1 1081 102
61031Medium Orchid→672AmethystClose ΔE 4.8 131 102
61080Orchid→624AfterglowApproximate ΔE 8.0 653 133
61033Dark Orchid→673LavenderApproximate ΔE 7.6 674 135
61255Deep Orchid→674Russian VioletApproximate ΔE 7.4 694 673
61122Purple→675LuxuryClose ΔE 4.8 695 694
61194Light Purple→663VioletApproximate ΔE 5.6 687 673
61193Lavender→624AfterglowClose ΔE 2.5 661 653
61032Medium Purple→663VioletApproximate ΔE 6.2 673 687
61414Light Grape→626Deep IrisClose ΔE 4.1 695 688
61411Medium Violet→665Deep VioletApproximate ΔE 7.7 695 K38
61412Dark Magenta→605GrapeNear identical ΔE 0.6 603 654
61409Violet→137FandangoApproximate ΔE 5.6 1603 1910
61191Dark Rose→135RenaissanceApproximate ΔE 6.0 128 110
61192Fuchsia→135RenaissanceClose ΔE 3.2 137 110
61413Grape→654OrchidClose ΔE 4.1 137 603
61423Aubergine→676Royal PurpleClose ΔE 4.9 635 605
61214Medium Chestnut→654OrchidApproximate ΔE 8.0 1910 632
61183Black Cherry→368Royal BlueClose ΔE 4.9 689 358
61189Dark Chestnut→K38Deep Violet PurpleClose ΔE 3.1 665 696
61357Dove Gray→411Palm LeafPoor match ΔE 12.5 451 612
61464Light Mist→483Light GrayApproximate ΔE 9.6 116 101
61465Dark Mist→612Lilac BlueApproximate ΔE 9.6 622 672
61434Light London Fog→612Lilac BlueApproximate ΔE 7.7 622 672
61356Light Cool Gray→485GrayApproximate ΔE 8.1 612 484
61471London Fog→614Slate LilacApproximate ΔE 7.3 364 365
61353Battleship Gray→487Gun Metal GrayApproximate ΔE 7.1 314 342
61041Medium Dark Gray→485GrayApproximate ΔE 8.6 452 487
61166Medium Steel Gray→487Gun Metal GrayApproximate ΔE 6.5 453 486
61040Medium Dark Khaki→453Dark TaupeApproximate ΔE 8.0 487 486
61358Cadet Gray→453Dark TaupeVery close ΔE 1.2 486 415
61219Gray→487Gun Metal GrayApproximate ΔE 6.1 453 486
61011Steel Gray→485GrayApproximate ΔE 9.1 484 612
61355Light Gray→487Gun Metal GrayApproximate ΔE 9.0 614 486
61354Dark Cool Gray→488Dark GrayClose ΔE 4.8 416 486
61220Charcoal Gray→486Slate GrayClose ΔE 2.5 488 453
61439Cool Black→489Charcoal GrayClose ΔE 2.8 360 488
61005Black→360Dark NavyClose ΔE 3.0 635 489
61352Piano Black→206Wreath GreenPoor match ΔE 11.1 416 257
61077Jade Tint→483Light GrayClose ΔE 2.7 361 801
61446Pale Caribbean Blue→K33Blue HarmonyClose ΔE 4.2 291 310
61045Light Teal→220WintergreenApproximate ΔE 6.1 219 291
61443Light Aquamarine→378Deep Sea TurquioseClose ΔE 2.8 384 312
61442Aquamarine→385NiagaraClose ΔE 3.5 378 392
61046Teal→484Country GrayClose ΔE 3.1 434 342
61513Wild Peacock→378Deep Sea TurquioseClose ΔE 2.5 384 391
61090Deep Peacock→378Deep Sea TurquioseClose ΔE 2.6 385 384
61230Dark Teal→392Honey BirdClose ΔE 3.7 385 314
61503Green Peacock→222TealClose ΔE 3.0 221 K37
61448Light Kelly Green→263Pale JadeApproximate ΔE 7.7 221 253
61469Leaf Green→200True GreenClose ΔE 4.0 205 265
61051Christmas Green→200True GreenApproximate ΔE 5.4 233 247
61101True Green→233Irish GreenClose ΔE 4.9 232 264
61451Summer Green→255EvergreenApproximate ΔE 5.1 264 222
61079Emerald Green→264Medium GreenClose ΔE 4.1 200 233
61447Kelly Green→200True GreenApproximate ΔE 5.4 205 265
61517Coachman Green→392Honey BirdApproximate ΔE 6.2 314 O74
61208Mallard Green→293Blue SpruceApproximate ΔE 6.1 265 266
61449Dark Kelly Green→294Pine GreenClose ΔE 3.9 344 436
61536Midnight Teal→489Charcoal GrayVery close ΔE 1.4 360 488
61450Ultra Kelly Green→749MahoganyClose ΔE 4.3 489 739
61151Powder Blue Tint→483Light GrayClose ΔE 2.9 361 800
61203Light Weathered Blue→622GeishaApproximate ΔE 7.9 612 672
61172Medium Weathered Blue→614Slate LilacApproximate ΔE 5.2 358S 632
61171Weathered Blue→676Royal PurpleApproximate ΔE 6.9 616 765
61436Ocean Blue→358SMidnight NavyVery close ΔE 2.1 616 765
61438Ultramarine→307Rocket BlueNear identical ΔE 0.9 334 308
61441Deep Blue Sea→294Pine GreenApproximate ΔE 5.5 334 307
61445Dark Jade→358SMidnight NavyClose ΔE 3.3 367 366
61162Deep Teal→344Pilgrim BlueApproximate ΔE 7.5 488 294
61444Deep Jade→333Baltic BlueApproximate ΔE 5.5 334 367
61206Dark Jade→314Federal BlueApproximate ΔE 5.7 364 365
61096Dark Turquoise→364Starlight BlueApproximate ΔE 6.1 333 365
61435Caribbean Blue→364Starlight BlueClose ΔE 3.9 365 OO7
61094Medium Turquoise→362Pastel BlueVery close ΔE 1.1 371 370
61440Pale Turquoise→K33Blue HarmonyClose ΔE 2.4 291 310
61095Turquoise→370Mint JulepVery close ΔE 1.6 362 371
61437Light Caribbean Blue→384CascadeVery close ΔE 1.5 312 378
61468Light Peacock Blue→K07Solar BlueClose ΔE 3.5 373 332
61430Pale Sapphire→371Tahoe BlueClose ΔE 3.5 362 363
61252Bright Peacock→372Blue PacificClose ΔE 4.9 384 363
61429Bright Sapphire→332PeriwinkleClose ΔE 4.7 373 K07
61249Cornflower Blue→362Pastel BlueClose ΔE 3.6 371 370
61134Peacock Blue→363Columbia BlueClose ΔE 3.2 372 371
61428Light Sapphire→332PeriwinkleClose ΔE 3.9 K07 373
61431Sky Blue→363Columbia BlueClose ΔE 4.1 371 612
61165Light Sky Blue→483Light GrayApproximate ΔE 8.0 361 622
61459Alice Blue→369Blue FrostApproximate ΔE 6.8 383 310
61074Pale Powder Blue→622GeishaApproximate ΔE 9.0 101 801
61433Pale Sky Blue→310Colony BlueApproximate ΔE 5.3 370 369
61145Powder Blue→612Lilac BlueApproximate ΔE 7.0 371 362
61222Light Baby Blue→612Lilac BlueApproximate ΔE 9.4 362 371
61028Baby Blue→661Light VioletApproximate ΔE 9.2 612 372
61029Medium Blue→372Blue PacificApproximate ΔE 8.8 612 363
61196Blue→OO7N / AApproximate ΔE 7.8 365 373
61253Dark Sapphire→364Starlight BlueClose ΔE 4.8 365 333
61425Medium Sapphire→364Starlight BlueApproximate ΔE 6.8 365 333
61426Electric Blue→367BlueberryApproximate ΔE 5.6 366 O55
61076Royal Blue→368Royal BlueApproximate ΔE 6.5 K38 665
61143True Blue→367BlueberryClose ΔE 4.9 366 O55
61198Dusty Navy→688Grape JellyClose ΔE 2.4 687 695
61432Dusty Blue→333Baltic BlueApproximate ΔE 5.3 364 614
61466Cerulean Blue→365Medium BlueClose ΔE 4.2 364 OO7
61030Periwinkle→622GeishaApproximate ΔE 9.8 612 672
61427Deep Sapphire→334Concord BlueApproximate ΔE 5.2 333 O55
61422Light Indigo→635Arab PlumClose ΔE 4.0 676 689
61200Medium Dark Navy→368Royal BlueClose ΔE 2.4 357 689
61535Team Blue→K38Deep Violet PurpleApproximate ΔE 9.2 665 368
61424Azure→367BlueberryApproximate ΔE 5.7 366 333
61460Medium Electric Blue→367BlueberryClose ΔE 4.1 366 O55
61467Dark Cerulean Blue→367BlueberryApproximate ΔE 6.5 366 O55
61042Deep Royal→368Royal BlueApproximate ΔE 5.4 K38 665
61416Iris→688Grape JellyApproximate ΔE 8.8 K38 665
61418Pale Iris→673LavenderApproximate ΔE 8.6 663 632
61417Blue Violet→688Grape JellyApproximate ΔE 5.1 665 K38
61235Deep Purple→K38Deep Violet PurpleClose ΔE 3.1 665 368
61112Royal Purple→K38Deep Violet PurpleVery close ΔE 1.6 665 696
61195Dark Purple→K38Deep Violet PurpleClose ΔE 2.6 665 696
61415Dark Royal Blue→O55N / AClose ΔE 3.4 366 367
61197Medium Navy→696Regal PurpleClose ΔE 3.5 689 665
61420Medium Indigo→616Tyrian BlueClose ΔE 3.4 765 689
61461Oxford Blue→335Midnight BlueApproximate ΔE 8.0 344 294
61044Midnight Blue→358Navy SatinClose ΔE 4.0 357 335
61043Dark Navy→635Arab PlumApproximate ΔE 5.2 616 765
61421Navy Blue→635Arab PlumClose ΔE 4.7 616 765
61419Indigo→635Arab PlumClose ΔE 4.0 676 696
61901Light Lime Neon→542CockatooPoor match ΔE 10.3 273 546
61905Bright Yellow Neon→546SnapdragonClose ΔE 3.4 544 542
61914Light Orange Neon→533ApricotApproximate ΔE 5.4 562 525
61904Lime Green Neon→228Cape GreenPoor match ΔE 13.0 273 244
61953Tangerine Neon→537CarrotClose ΔE 3.4 755 526
61913Hot Pink Neon→155Martha WashingtonClose ΔE 4.4 1084 1107
61910Fushia Neon→127Hot PinkApproximate ΔE 6.1 128 105
61909Medium Pink Neon→104RosettaClose ΔE 3.1 125 1902

Match quality is the CIEDE2000 color difference (ΔE00) worked out from screen RGB values. Sheen (rayon against polyester), thread weight and dye lot also change how a substitute looks, so check a real thread card before ordering.

About Gunold POLY 40

Gunold POLY 40 is a German trilobal polyester embroidery thread known for consistent tension and a large palette that covers the shades commercial digitizers ask for.

About Floriani Polyester

Floriani Polyester is a 40 wt polyester embroidery thread from RNK Distributing, popular in the U.S. home embroidery market.

More Gunold Poly conversion charts

All Gunold Poly charts →

Frequently asked questions

Is there a Gunold Poly to Floriani conversion chart?

Yes. This page lists the closest Floriani Polyester color for all 300 Gunold POLY 40 colors, worked out with the CIEDE2000 color-difference formula from each brand's published color values.

How many Gunold Poly colors have a close match in Floriani?

32 of the 300 colors (11%) rate Very close or better, and 61% rate Close or better. The other 118 only have approximate substitutes.

Can I convert Floriani back to Gunold Poly?

Yes, use the reverse chart, Floriani to Gunold Poly. The two palettes are different, so the reverse match is not always the same color you started from.