1 skin for 1 unit

i ws wondering if there is anyway to make it so that an imported skin only affects one unit, like:

one hero with the naga royal gaurd mdl has the reg Royal gaurd skin

another hero with the same royal gaurd mdl has a custom imported skin

is this possible?

No, you'll have to import two versions of the model.

add new native to wc3 and change skins onfly.

how do i go about doing that?

Use Seach over the forum.

wtf u can't change skin, you have to reimport the model with paths to new skin

You come up with the stupidest solutions ever.
This has been discussed about adding natives 100 times.

The answer is:
You cant, the only way to add a skin/model is by replacing a preplaced skin/model.
Reimport the model, and replace it with a model you will never use.
EDIT: Jacek is right.