It’s very possible that they are the same color. There’s a lot of places in the process of getting those images to your eyes that the colors could have changed. Different camera settings or lighting situations, different compression rates (and those images are heavily compressed), your computer (Macs and PC’s handle color very differently), your display properties, your monitor settings, etc.
The only way to know for sure is to see them with your own eyes, or talk to someone who has (and even that isn’t failsafe if they’re a little colorblind!).
The photos are different. The early Walthers photos of the heavyweights will show them as being dull, and junky looking. The newer photos show the cars as being shiny and high quality.
Different photograpers using different cameras, different film, & different lighting.
Printers ink seldom matchest special colors anyway. It’s mixed.
Was the original a negative or a positive?
I like Mr. Beasley’s answer - ASK walthers.
PROTOTYPE RR car’s were out in the sun. SELDOM did the cars exactly match, unless freshly painted. They faded. A little variation is reasonable. That’s what you want to find out.