Quite a reunion going on in here!
I guess I could at least scan and post the bits that matter to the discussion.
Difference in filter and film explain the variance of colors seen on different shots of the plane, but cannot explain the difference between markings in the similar shot.
Since the word photoshop has been dropped, I expect that this didn't happen once, but twice in time.
You've been studying this a/c for some years, so there is little I can bring against that, but it certainly has kick started my interest again!
There is a third possibility, which added to photoshopping and old fashion retouching, and that's (re)painting in the field. And I am talking about a possible mix of these as well.
Itching to scan these tids and bits, will do so later today.