The aim of the '93 mixes was to create stereo PCM tracks with a high dynamic range using the best quality, earliest generation material available. In the case of Star Wars, the 70mm printmaster was the best sounding source they could find. If they hadn't also felt the need to add unnecessary changes on top of it, it would have been a near-perfect rendition of that mix, aside from lacking discrete channels and separate LFE. For Empire, they used an early four-track master that is very close to the 35mm version except for the mistakenly missing snowspeeder crash sound. Jedi went all the way back to thirteen-track stems and was more thoroughly remixed than the others; there are no changes in content but the levels and directional placement may be slightly different at times.

I was not aware of any stretching done to the audio tracks, but it's possible if there was some damage somewhere. The spot you mention in Empire, there seems to be a rather large jump-cut in the music, probably done to accommodate a change in the edit made after the scoring was already finished, but as far as I know that's in every version . . .

Sorry if we're getting a bit off-topic in your thread here. ;)