Image resolution is my obsession, followed by colour. With colour, as I said, it’s very hard to determine what’s correct. Nobody, not even a projectionist (who may have seen the film more than anyone) can rely on memory because colour memory (even short term) is too flawed.
Added to that, perception of a particular colour is strongly conditioned by what colour you see before or adjacent to it. I’m sure you’ve seen the Color Optical Illusions which demonstrate this effect (The Flag Color Optical Illusion in particular).
So in the screen grabs you posted, most would agree the faces are too pink in the first one. But that, I believe is because we’re comparing it with the second which, in my opinion, has a cyan cast. If you saw the first image in isolation, it would not be so clear cut.
One would hope, when remastering, they had access to un-faded release or show prints for colour referencing, but I suspect such prints, or resources to acquire them, are usually unavailable, particularly for some of the films we’re talking about.
I like your conspiracy theory and might sign up to it if I didn’t have so many cracking SW blu rays.