I was wondering how much is the difference in points between a fc with all 300 rainbows, wich would be a million, and a fc with all 300, and how many points that would be
It depends on the song ofc. The maximum score is 1 million regardless of song or difficulty, so the more objects there are, the more minute the score changes. If you want the technical answer, rainbow 300s are supposed to be 320, but idk where that would be applicable because of the aforementioned reason.