My understanding is (from doing alternate hair textures for published hair models) you can reference the original artist's transparency map in your PZ2 file... but you cannot use in any way the original artist's colour map. Correct me if you know differently.

So, are we kinda looking at the same issue, here? Does that place sharing GCed materials into a no-fly zone?

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks