I feel that runs that will have major differences between versions should have separate leader boards. If you are using the old version you do not have to encounter 1st Prize in Character% and Death% will have differences between versions since it is a small run and Baldi has different speeds between the versions.

(edited: )

Thank you for pointing this out, there will be a 1.2.2 and a 1.3 version for Character% and Death%.