IMO, Peter Tosh's version of "Johnny B. Goode" is not truly a variation of the original. It's the lyrics to "Johnny B. Goode" sung to a rhythm and melody of Mr. Tosh's devising. There's nothing wrong with that, but it doesn't reflect the way variations of songs naturally evolve via the "folk process".

Compare it with Jim & Jesse McReynolds version: CLICK (audio only).

But, overall, I agree with Don Wise's post above, that "Memphis Tennessee" has a lot more going for it when it comes to lending itself to interpretation.