OPB uses Phil’s NP Ludwig Bass kit.
OPBk uses my NP Electric Jazz Trio 3 kit.
Aside from the tone differences in the drums and bass, and the mapping, obviously, the only difference in the two versions is that George’s guitar solo is not in the OPB version. On the OPBk version, it is played on the electric piano.
Package includes: 2 .sng files, source midi (note that source midi incorrectly has D# in the bass in measure 7 of the verses. It should be D) opb, and opbk midi files, chords and lyrics in pdf and plain text.