I want to know for the case of Sunshine and Galaxy. I am aware that it`s not allowed for Mario 64.

That seems like a question for the games's respective speedrunning discord servers! Sunshine - https://discord.gg/jX38aXCv9y Galaxy - https://discordapp.com/invite/0dEhnBwKhhgt1nWe

afaik IL runs done on the 3D All Stars version are not allowed on the Galaxy leaderboard.

Thank you Phantom. Greatly appreciated. :)