You would probably be interested in this thread for the theatrical visual changes in Star Wars:

http://originaltrilogy.com/forum/topic.cfm/Print-variations-in-77-Star-Wars/topic/14705/

In short, there were multiple extremely minor print variations in the theatrical version, probably due to a combination of last minute changes and poor version control, but AFAICT aside from the alternate crawl/flyover, home video releases were faithful to one of those versions, and the GOUT is moreso.

As for the audio changes, all three distinctly different theatrical soundtracks for Star Wars are well-preserved and you can listen to the alternate versions yourself.

As for the other movies, ESB of course had two totally different cuts, and we've only seen/heard the 35mm one on home video or preservations, and just a list of changes for the 70mm one from people's memories. It's unclear to me if the 16mm mono soundtrack was the same one used for theatrical mono presentations, but if it was, there's another audio variant for you. AFAICT nobody's spotted any differences in ROTJ presentations that would indicate home video got something different.

Oh, and this project isn't using a Technicolor print.