About the eternal question if the various audio tracks on the video releases of Empire in the eighties is the original theatrical 35mm Dolby Stereo mix, I guess there's only one way to be sure, listen to them and compare.

I know that hairy_hen, myself and others have not been able to find any differences in content between them, so I would guess the same audio mix was used on all video releases until they went back to the source material and remastered it for the Definitive Collection LD set in '93, I guess the same goes for Jedi, but which track and which LD has the best sounding one would be interesting to find out.

Edit: The early LD transfers also often lacks many frames at reel changes, I think the JSC of Empire loses more frames compared to SWE, I remember that the cut from Luke arriving to Cloud City to Han being sent to the carbon freeze was very jarring in the Pioneer SWE LD for example. Some tracks are more complete than others so there's lots of editing required.