The tracks on "Forever, John" are a combination of tracks from the unreleased album "Perhaps Love", outtakes from various albums, and alternate takes. The two tracks you mention are apparently the "original recordings", which were skipped in favour of alternate takes, which found their way to be included on the album "Whose Graden Was This".
In 1980 John recorded an album to be called "Perhaps Love", which was refused by RCA, so the tracks were buried in the archives (instead, John went to Nashville and recorded "Some Days Are Diamonds"). These included "Four Strong Winds", "Rita Balough", "High Wind Blowin'", "River", "Dance Little Jean", and "Nobody Can Take My Dreams from Me".
The following tracks were outtakes from various albums: "No One" (outtake from "Aerie"), "On the Wings of an Eagle" (outtake from "Autograph"), "It's a Sin to Tell a Lie" (well, this COULD be from "Farewell Andromeda", but the time stamp does not fit; must have been some recording session in between), "Rusty Green" (outtake from "Rhymes and Reasons").
Hope this helps...