For star wars 2011/2004 audio I would honestly just use the 97 mix and just splice in the few content changes because the 2011 mix is basically just a horribly butchered 97 mix where they pulled every line of dialogue from a different source with very few content changes.
According to Ben Burtt, he went back to the original sources. And that much splicing of 5.1 audio is more work than it is worth. Except for Beru remaining unchanged, ANH is closer to the mono mix than any previous mix so it is closer to what I consider the definitive mix than the 97 SE.