The game engine is different, I bought it on my moms surface via the windows store and it's exactly like this:
https://www.youtube.com/watch?v=KIcP5NDb8WQ
So I don't think that it does support MTA, you should buy it via steam.
Game engine wouldn't be the biggest worry, not to mention GTA:SA only uses RenderWare Graphics, not the whole engine. Though, GTA:SA mobile still uses RenderWare.