It's a shame that we didn't get any unreleased tracks on the 2015 Deluxe reissue, although thank goodness we received 53 versions of "I Know I'm Not Wrong" and 45 versions of the title track.
There's another version of the unreleased song with guide vocals around the 10:00 minute mark in this video.
https://www.youtube.com/watch?v=8D7z8ka8KGM