Sorry, guys, but absolutely not. Unlike the digital recomposites of speeders in Empire and some of those I'm keeping in Jedi, the original Rancor was so notoriously bad that the cleaned up version is just way too apparently new. I'd actually love to replace all the recomposites and am still tempted to do it but some I most probably won't, because the only source is the GOUT and the difference between old and new is really small but I have GKAR as a source for the Rancor shots, so the quality difference is not big at all.
I always had a grudge against the recomposited shots, maybe worse than some of the added CG scenes and here's why:
When I was a small kid, I only had the original original STAR WARS on VHS and that's what I was growing up with until a few years later I got the SE trilogy set. I always loved to play the FX scenes frame by frame and analyse the FX and try to spot the imperfections and the mate lines and I just admired what they were able to achive in 1977 - 1983 without computers (especialy the asteroid chase and the cloud city approach - I knew which shots were the all new digital additions and didn't watch those that way, because there's nothing interesting about analysing CG that way) and I still kept looking for the originals more out of interest than for thinking they were better. And when, years later,I finally found the original Empire and Jedi, (they weren't easy to find here at all) I played the two versions on two VCRs at the same time and was switching between them to try and spot the differences...
...I was horrified when I discovered that some of the shots I so admired were actually fake. And I found out that the original FX did look amazing for the time and on top of it had a beautiful charm about them, exactly because of the mate lines and other imperfections; That's what first made me hate the SEs, not the CG, because I didn't feel cheated by the CG, I could clearly tell what was CG and what wasn't, but by the recomposites I felt tricked, because I finally realized that when watching the SE I couldn't (and still can't) be sure whether I'm watching what was achieved all these years ago without computers or not. And then as I grew up, I of course realized that the CG and 90% of all the SE changes harmed the films as a story, not only as an FX exhibition. And even though I don't watch the FX scenes frame by frame anymore, (well, not very often anyways :-) ) I still have that feeling of being tricked by the recomposites when I watch the films.