Okay, I'm a bit slow, so please bear with me.

I've found your TY2/V3 remaps on my Linux downloads folder - oooooFF! - and have installed them (already had TY2 installed). I've rte-decoded my main TeraiYuki2.obj - that transpired successfully.

Then - okay, here's where things get a bit grey - I loaded the default TY2 cr2 (not the Terai Yuki2 V3 cr2... mistake no 1??) and loaded a V3 Mat file... that was okay to do, right? So, now when I look at material zones in mat room adv, I see all of V3 material zones and the original TY2 mat zones underneath them.
Are the TY2 mat zones okay to remove (via PFE, which makes the process completely painless)? or did I stuff up somewhere along the line?

BTW, you did a spectacular job with those remaps: she looks stunning, David. Going to send V4 on holidays for a bit and play with Terai for a while.

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