Musical differences, musical similarities

In the old days when bands broke up they would often blame it on “musical differences” (rather than on drugs and that they hated each other). When the ironically named Yorkshire band The Beautiful South broke up, founder Paul Heaton blamed it on “musical similarities” (rather than on their recent records’ dismal sales).

So here is Aretha Franklin in 1972 with “Old Landmark” from her live gospel album Amazing Grace:

And here is Paul Simon in 1991 with a live version of “Gone at Last” from his 1975 album Still Crazy After All These Years.

I wonder if, by any chance, they could be related.