That's classic formula music. Pick a formula that works and go with it, and by the way, is that beavis on the left in those pics? HAHA
But anyways Bobby, you could probably do the same thing with 5 different blues tunes as well...it's all about repetition and whatever works with the song.
A lot of bands plagiarize themselves. It's a norm today. it's not like back when John Fogerty got sued for plagiarizing himself .. You will really find it in a lot of the modern rock bands ..
I blame the record companies for it. Once they find a formula that works they want them to roll with it. Even if it plows them over. It is also what kills groups.
It kinda makes it easy for cover bands though. Just for the simple fact that once you learn one of their songs you can play them all ..