Well, the 1986 laserdisc is the only possible source for the 1983 theatrical mix. And if there's no difference between that and the 1987 LD, maybe there never was a 1985 remix for Jedi?
Either way, if there really is no difference, that means it would be either:
1983 Theatrical Stereo
Dolby Digital 5.1 Remix
1993 Home Video Stereo Remix
OR
1985 Home Video Stereo Remix
Dolby Digital 5.1 Remix
1993 Home Video Stereo Remix
If there truly is no difference between the two, I'd venture a guess that there was no 1985 remix for Jedi, and that Star Wars and ESB were remixed in order to bring them up to the quality level of Jedi's mix.
Oh, and ABC - I liked the first back cover you had for Star Wars better. It fits better with the ESB and ROTJ teaser posters, IMO.