Found another video of The Ecstasy of Gold in 4K, may or may not be from the 2021 release, it's a bit yellow looking but other that it looks good and natural, no one looks as if they've been out in the sun all day.
It's not my fault that reviewers often get confused and mislabel 2014 for 2008. Only a few reviews have corrected that from what I've looked at so far.
Just like with The Producers, I don't think both movies are supposed to be that dark looking.
From what I've heard, the 2014 MGM blu is the same as the 2008 DVD. The version that I've seen so far that looks natural is the Italian blu. You can see quite the difference from the yellow MGM and blue Kino.