@demon2 what "score" means in this case is "music sheets". so a band score is basically music sheets that show you how to play the song on each instrument that is used in the song. similarly, a guitar score is music sheets that show you how to play the guitar part of a song.
@bull_shit usually the band score and guitar score have slight differences for the guitar part. sometimes the chords might be slightly different. one diffence that i noticed when just comparing the rhythm guitar is that the band score tends to tell you to play barr/power chords and the guitar score tends to use "beginner-friendly" chords. also, one thing that the band score shows you that the guitar score doesn't is the score for all of the guitarists (lead, rhythm, etc.).