Except those times where they are replicated it is kept in the same place your original choice can be found.
Maghar are horde.
Hm tauren are hirde.
You dont lose anything by swapping skins basically.
High elves though?
Not only are they an exact xlone, they would be kn the alliance.
So be players lose out on customization options.
It is bad design to make copies.
Let alone the fact its being request for only high elvss is indicative of the aesthetic nature of the requesr.