Why would you use production stills to regrade a film???
In this film’s case I’d see no point. However, with films that either have differing palettes in their various releases, or those that have been modified over the years and with no theatrical source as a reference; production stills can offer some clues as how the image looked in its neutral form.
All of the home video releases of JP 1-3, with the exception of the very first VHS editions, have a wrong colour grading with pink and magenta push drowning out the warm mud-brown and golden timing of the original prints. The laserdisc, DVD, Blu-ray and UHDs also have a very dull contrast, destroying any depth the image had. The 3D version is the closest to the prints and even that went overboard with the orange and the reds. The 35mm scan also doesn’t look as warm (yellow-green) as the prints should. It has a blue cast (much less than the home videos).