The question is probably stupid. Suppose that I'm going to do a mobile version speedrun (no ssu). Will it be compared to /gtavc/#any no ssu runs (because in the "platforms" Android and iOS are listed)? (The 10th anniversary edition has less bugs, more difficult controls and so on). In case of playing San Andreas with one hit k.o. mod, new game /gtasaohko/ was created. Same as /gtavc_chaos/. I mean, will mobile version be considered as modded classic one and ported to Android/iOS and new category/game will be created?

Why would it? It's an official release by Rockstar, just on a different device. That's like asking for a /gtavc_xbox/ or /gtavc_ps2/ page.

It would be on the same leaderboard, but noone has done a mobile run yet.

Yeah you can do a run on mobile if you want, I've tried but it drove me mad before I could bother finishing. I do have this run in All Robberies btw