Anyone thats worked proferssionally in this industry will know that what you see on screen (unless you are using a calibrated monitor) is absolutely not what you get in print.
So the sauturation level in these image has been setup for output on a specific press and is still a work in progress.
The original CPO's were printed and glued to a very thick lexan that has quite a rough texture (by todays standards). As I said I have roughness tested it and have found a close match in the USA.
The issues with scanning this artwork (from anything other than the original paintings) is that not only are you scanning a printed halftone pattern you are also scanning through almost a frosted surface that refracts the light, breaks up edge detail and generally causes quite a lot of interference.
The scan of the original top section artwork, while great, isnt much use when compared to the lower front.

Scan of original artwork top as compared to a scan of an original CPO front section.
As you can see contrast and detail are nowhere near the same.

I even considered painting in detail based on the original artwork as a reference, this work in progress screengrab shows a rough pass (that needs refining), but that wouldnt be failthfull to the original so I stopped with this concept.
Using AI or any tool that alters the original isnt of interest to me either.
The conclusion was that until the original artwork of the front section becomes available its pointless to attempt to incorperate the new scan with the old. They are just too far apart.
So what we are doing now is intergrating the colour pallett, contrast, tonal range, saturation and 'feel' of the original with my version to get something that will print out in good quality and reflect the art as originally intended.
I Hope to have an update on this later next week.