you can change anything you want. filename makes no difference, with the exception that if you have a song in your xbox with a filename song_a, and then in your pc you change the filename to songa, when you put it back on your xbox, it won’t overwrite song_a, so you’d need to find it, or you’ll have conflicting files.

as far as the song id, it’s fine to change it as well to whatever you like, as long as it’s not being used by another song, or you’ll encounter cache issues.