IIRC, The 1993 DE soundtrack has all new special effects sounds. The dialouge follows the 35mm/70mm mix. So it doesn't really sound that much different, unless you really listen hard to some of the effects, and even then they worked hard to makie it sound better, but not different. The only source for the different Aunt Beru voice, 3P0 tractor beam line, etc, is the mono mix. Some of the sound elements, such as the 3P0 tractor beam line, was added in for the special edition.
Someone who is more knowledgeable than I on this may correct me, but I think the 35mm and 70mm mixes on Star Was is effectively the same. Now the 70mm track for ESB is different than the 35mm track. The 70mm track is currently unavailable, I think.