What is the difference between purple and blue post HEPA filters for V15?

My V15 came with purple filter, but in the replacement parts catalog I can see 2:Blue 970013-03 Purple 970013-02Is there any difference between them except the color? Why only blue one has “HEPA” mentioned in its name? Does it mean purple isn’t a HEPA filter?Would be nice if someone could clarify th

Finally found a Blue Filter for the V15 Detect I wasn't a fan of the Purple one : r/dyson

Washable Dyson HEPA Filter Compatible with Dyson V11 V15 SV14 Cordless Vacuum Cleaner Parts from China manufacturer - Nanjing Blue Sky Filter Co.,Ltd.

Fit For Dyson V11 SV14 V15 SV15 Parts No. 970013-02 Hepa Filter Accessories Cyclone Absolute Animal Cordless Vacuum Cleaner

Hepa Post Filter Compatible with Dyson V11 Torque Drive V11 Animal V15 Detect Vacuum Cleaner Accessories Part No. 970013-02 - AliExpress

What is the difference between purple and blue post HEPA filters for V15?

Dyson V15 V11 SV14 Washable Filter Hepa Cordless Stick Vacuum Cleaner Spare Parts Hepa Post Filter clean Replacement Part - AliExpress

Adapted For V11 Sv14 V15 Sv15 Parts 970013 02 Hepa - Temu Canada

2-PACK Replacement HEPA Filter Compatible with Dyson V11,SV14,V15 Cordless Stick Vacuums,Compare to Part # 970013-02 970013-03 : : Home

Blue Power Post-Motor V6 HEPA Filter & V6 V7 V8 Vacuum Pre-Filter,Replacement Filter