I seem to vaguely recall there having been something a little different with the Wampa stuff between seeing 70mm ESB a day or two after opening day and then a 35mm showing a bit later on. I probably have old notes on some old computer somewhere back before all the various versions of everything and longer time made it all more muddled.
One other thing that makes it all the trickier, is I believe, at least for Star Wars (ANH) but perhaps for ESB as well, that the very initial batch of 70mm prints for the opening couple weeks at a few theaters had a slightly different edit than all the later 70mm prints they made and I don’t believe anyone has ever turned up a recording from the very initial cut 70mm SW shown at a very few theaters for a short time. I heard they made up a whole new batch of 70mm a few weeks in as they were getting the 35mm ready. (FWIW, many of the claims for the missed toss and extended scene where the door took longer to prop up seem to be from people who saw SW within the first week at a few specific locations only.)
(on another side note, has there ever been any home release of Star Wars (ANH) that has the original “close the blast doors, close the blast doors, open the blast doors, open the blast doors” scene in it? For a while that was all but erased and then it did get added in SE but not in the form it was originally although a bit closer in certain ways.)