Not that I know much about SE audio mixes, but I was under the impression that only ANH got a brand new audio mix for the 2004 release (largely inferior to the 97 mix), while ESB and ROTJ’s audio mixes were based on the 97 mixes with some changes, much like how ANH’s 1993 audio mix deviated from the original 35mm stereo mix a lot more than the 93 mixes of ESB and ROTJ.
edit: Oh, didn’t realize that I bumped the thread by accident. Sorry.