Harmy uses a 540-pixel tall frame for both DeEd and ReEd, but matted onto a 720p frame for Blu-ray compatibility. For Star Wars DeEd, Harmy got a his video de-purpled and re-encoded by another user, and he did his corrections based on that. For ReEd, I imagine he worked directly from the original sources. So the DeEd is re-encoded more times than the ReEd. Also, there have been some problems pointed out with that original de-purpled encode, so I’m guessing it wasn’t as good as it could have been. The 2.x DeEd versions of the other two films aren’t based on a de-purpled re-encode like Star Wars, and look better IMO. He won’t be able to use that for 3.x, so I imagine all re-encode-related sharpness issues will be resolved then. This of course doesn’t consider that the mismatched sources may need to be sharpened or blurred, fake grain added, etc, to blend better with each other.

As for greenish, Harmy’s Technicolor reference had a greenish cast, so the film was made greenish on purpose to match the color reference. Since then, he has learned that the reference isn’t as greenish once fully corrected, so he won’t go that far in the next version. ReEd didn’t have as authoritative a color reference as DeEd, so Harmy felt freer to do what simply looked good.

Hope that helps.