Ah, of course I mean the original 70mm mix from 1977, not the SE. ;)

If there's any discernible difference between the DTS and Dolby versions of the SE, I'd be very surprised. Any such disparity would probably relate only to their differing ways storing and encoding the audio data--ie, theatrical DTS format stores the LFE information in the surround channels and low-pass filters it out to the subwoofers due to bandwidth restrictions. They may have corrected for phase and level slightly differently because of such things, but that's the only reason I can think of. Regardless, the SE soundtrack is decidedly inferior to the '77 original both in dynamics and sound quality, though still vastly preferable to the awful 2004 dvd mix.