An excellent link that answers any possible questions. I'll pop a link here for convenience.

I already spotted the difference in lighting which pretty much settled is as "real" for me. When part of your job is photoshopping digital models into real backgrounds, lighting changes kind of pop out at you. To alter an existing image of that complexity to change the lighting direction is, as they put it, a "non-trivial problem." It would be easier to put a real probe around the Moon.

I hadn't even thought about the large Chinese image being assembled from smaller images, which often results in "overlap" artifacts (hence the "new" crater that's really an old one). I think I can be forgiven for that oversight, since it was China's head scientist on the project who called it a "new crater," so he apparently missed it too.