I guess they are pretty similar but the same could be said for pretty much any rockabilly or rhythm and blues track that came out in the late 50s/early 60s ala Chuck Berry, Buddy Holly, or early Beatles.
Promised Land sounds a hell of a lot like Johnny B Goode... maybe its just me though... I mean most of these songs are basic 1,4,5.
OMSN is a bit more intense than Travelin' Band though, with that sweet riff that Bob and Jerry mirror each other on and the walkup which packs quite the punch of some versions.
MTV.com has a video of OMSN Live at the Cow Palace, 1976 that I really like. Not the most rockingest version of the song but the video pretty much rules. The crowd is going wild and the band is on. Jerrys fingers move effortlessly over the strings.
a whole new gameball