I was listening to I Ain't Signifying today and then recalled that Mick etc redid that one for the exile extras......they added drums horns harp and had Mick T play slide throughout ......man I vastly prefer the demo with the tin can drum  and the smoldering Mick Taylor leads. Of course I prefer Mick Jagger's 70s vocals as well.
are there other tunes that were undone by being recast?

Mel you of all people NEED to hear Mick Taylors lead lines on the original...great stuff ala Hide Your Love away