After testing, they do share the same mesh files (even the weapon), just have to rename them. (tsk tsk tsk...lazy designer lol xD)
I will post the screenshot later, right now I'm gonna test if there's gonna be any glitch when in different motions.
Btw, for those who want to edit yuki or other special character (like lime), just remember that unless you have CS item that's quite different from other, the change will make ALMOST everyone all looks the same....(use ur rare CS to change into the files you want, that way you wont see too many "copies" of you running around)
EDIT: no motion glitch whatsoever, everything worked perfectly~ Here's a few pictures =D