A bit of unspoken Fireball pinball history:
There are at least FOUR different variations of the factory Fireball backglass I have personally seen, which includes the prototype and German versions, not including the CPR remake, or the Shay version created on plexiglass (which coincidentally also has colored moons which people probably may not realize and shown below for reference).
That would make SIX versions.
There might be a SEVENTH I cannot recall from the 1990s, as I don't remember who might have done it, if someone even did.
I don't think Alan Meyer did this glass.
Comparing a single version of the backglass means a person is missing a major part of the artwork equation in terms of this title.
The bottom line here is the backglasses are are not all the same, and all have color variations on the moons and stars, predominantly.
Some did, some did not.
But, comparing the production game is just one set of eyes looking at the game in a single manner.
In my estimation, most likely variations during the ink screening process for at least part of the production run or at the request of the artist himself, which has happened before during pinball history. I have examples of such changes on my walls. A good example was Embryon that used purple versus blue for the top pantones on early production backglasses.
I doubt that CPR had access to every single version for comparison, or the original drawings (such as below) as they did not include the pantone ink screen markings.
Which is truly correct?
What was the original intent?
Only Dave Christensen knows
I cannot speak for which version CPR used for re vectoring or how much latitude was used for the backglass design, but I do know it is not directly the same as the production backglass, but more akin to the early production.
If people are concerned, just ask Stu/Wayne/Kevin.
I am quite sure they did some type of research.
After recently locating a third German backglass added my archives, it is very similar to the CPR remake in coloring.