Are the files on the root filesystem different from Series2 to Series2.5?

I am asking specifically pertaining to an R10 as compared to other Series2 DTivos. They have been on the same software since 6.3e. Does that mean the files are the same?

I am working on an R10(Series2.5), and I need a file from 6.3e. I have it from a Series2, but would it be the same as from an R10?