My research for TESB and ROTJ is not as extensive (and there haven’t been nearly as many changes). I think it goes like this:

TESB
1 - 70 mm version - some effects not complete, slightly different audio edit. An in theater audio recording exists.
2 - general release - Preserved in the earliest home video with the original theatrical audio. Puggo Strikes back has a unique mono audio mix.
3 - 1985 new interpositive version - first seen with a slightly altered audio mix (some changes plus 5 channel instead of 4 channel audio in the matrix) in the Definitive Edition, Faces, and 2006 GOUT.
4 - 1997 SE
5 - 2004 DVD
6 - 2011 Blu-Ray

ROTJ
1 - Original theatrical version, preserved in the earliest video releases
2 - 1985 new interpostive version - first seen with a slightly altered audio mix in the Definitive Edition, Faces, and 2006 GOUT.
3 - 1997 SE
4 - 2004 DVD
5 - 2011 Blu-Ray

For both of these, there was a slightly different audio mix done in 1985, but the differences are in the mixdown from multi-channel surround, not in the audio stems themselves. I have not checked yet of these match the original theatrical audio or the 1993 audio. I think the former considering that ANH differed only by 1 line between the 77 and 85 mixes.

I believe that for all three movies, except for the mono mixes, the surround mixes were essentially the same from the original theatrical mix to the 1997 SE (obviously there were changes, but they seem to be changes to the original mix). 2004 saw a slight attempt to remix that resulted in some sounds (namely the music) being in the wrong surround channel. 2011 saw a complete remix from the ground up of all three movies - with mixed results. Overall they are vastly improved, but some clips have either deteriorated or were processed badly and don’t sound as good.