With regard to 4K83 - that was scanned from a show print that was struck directly from the negative, if I’m not mistaken, which means while the details are extremely clear and clean, the color on the print doesn’t reflect what an actual color timed release print would look like, so unlike 4K77, you can’t just white-balance it to the sprocket holes;
Not only that, but it being all red faded makes it more complicated of a source, and I remember Williarob mentioning that he tried using Dre’s color restoration tool on it. Not sure if he ever posted the results.
best thing to do there is to use the LPP scan as a color reference to match the 4K83 show print scan to. Frankly I’m a little surprised that hasn’t been done yet.
I’ve been in the process of doing that for oohteedee for a while now. It’s taking longer than I had hoped, but I’m halfway and it’ll be done eventually. Keep a lookout. 😃