I listened to this file and it is very interesting to hear the actual in-theatre recording again. Part of the time I ended up muting the right channel and just listened to the '77 version. It has been useful in my effort to recreate the 70mm soundtrack, causing me to go back and do a couple edits over again. I found that there are actually 2 extra Chewie vocalisations in the cantina scene, one of which I hadn't really noticed before.

Much of the older version does sound very much like the DC mix, though there are some oddities, which I presume are shortcomings of the recording and not actual differences. For one, the surround channel is barely audible throughout; and the bass content is indistinct. I can hear that it's there, but it isn't clear enough to tell accurately--sometimes it seems noticeably louder than what's on the laserdisc, and other times more subdued. This can probably be attributed to the theatre acoustics in addition to recording flaws. It makes for a good general reference, though ultimately I still have to rely on my own judgement in terms of creating an LFE channel.

I'm going to have another listen and see what else I can find. Thanks for this, Moth3r!