The wrong difficulty for that song would result in a rude awakening
I wonder if that One More Lovely BMS is an older BMS. That is, was it made before Happy Sky re-defined the difficulties.
Does the another BMS say a #RANK number higher than the Hyper version?
If it's the same, that might be the way most other pre-HS BMS might be.
I could implement a 'order by # of notes in song' method, though.