I listened to the recording pretty closely, and those were the only differences I could spot. Everything else about it sounds exactly the same as the 35mm version in terms of content.

Pretty surprising to me that the error in the cave scene was actually there originally. That and the laser sound during the battle are things that were fixed for the 35mm, because they seem to be actual mistakes. However, I don't know why the TIE fighter engine sound would have been removed.

The snowspeeder crash sound effect is definitely there, which makes its absence in the 1993 mix all the more confusing. I guess they forgot to put it into the 4-track master, but remembered by the time the theatrical stereo went out; but then in '93 they didn't notice that it was gone.

Am I the only one who thinks the 70mm version of the end scene actually plays better, in a way? It sounds odd to me on one level because I'm so used to how they changed it, but at the same time the line about finding Jabba the Hutt is unnecessary. Hmm . . .