I have several pair with the RGB for various skins including mine. And they still don't match. Also, one HUD will differ from the other, Heck the same creator but different shoes have different RGB values. Folks with different monitors and/or viewers will see the skin tone different.
But fiddle with them I will, spending the time is worth it in the end.
But to be honest I have all but stopped buying Hud shoes. There are some great looking heels out there if you look. If you want to drop me a IM in world I'll pass ya some LM's