Additionally, should alternate variants of songs (acoustic, cinematic, heavy edit, etc) be considered single + remix? Or no since they’re not remixes of the original songs, they’re seperate recordings from scratch?
I would treat them the same as remixes. If the original version is also included - same RG, if not separate.
But there will always be edge cases, e.g. remix releases with and without the original version. I would consider what would be a better fit. I would also look at the presentation (same cover art?).