Why have two skins? It really intrigues me.

There's actually a third, and it's tied to the quest decision to make whether to go Mezari, Sheredyn or remain United Empire.

Cool! I have a question if a different faction behaves the same way, but I don't want to give any spoilers.

Spoiler:

Do the Cravers have something similar? I've never noticed

Sadly no. Their quest can't tell you up front what the final reward is, and the devs don't want people stumbling into that kind of a change without realizing it, so there's no massive change of that sort.

Reminds me of the Allayi diplomat becoming black and blue during the winter. in EL. A nice touch of detail.