Gotcha. ;) I was away for a few days so this is the first chance I've had to listen to it. Haven't even checked the synch, I was just listening to it on its own first. As I suspected, it sounds very similar to the '93 mix most of the time, but there are some definite differences. The snowspeeder crash sound is one we already knew about, but there are a few others also: when the Imperial walkers first open fire on the rebels in their trenches, the explosive sounds from the laser impacts are different in the '80 mix than in the '93; and about a minute or so later there is a snowspeeder laser blast and flyby that is significantly louder in the '80 (it's there in the '93, but much lower in volume). Not especially important, I guess, but worth mentioning. There may also be others I haven't found.

Since the '93 version comes from a source that is at least a generation older than the theatrical stereo mix, it isn't much of a stretch to imagine that a few more sound effects were added to their final mix that had not been there previously. To me, this suggests that the elusive 70mm mix of Empire quite possibly did not contain these sound effects either, since it would have been done first. If true, the mystery of the missing snowspeeder effect may at last be solved. :)

I did notice a few distracting jump cuts here and there, but I couldn't tell whether they were actually part of the sound or if they came from synching issues. Unfortunately, I didn't make any notes of the times, because at first I thought it was just my computer being funky. I'll reiterate that care must be taken to blend the tracks together, particularly around the side breaks.