As for whether the color on 4K77 v1.0 is accurate to the technicolor print used, is kind of and kind of not as far as I’m aware. I think it’s mostly accurate, though I recall discussion around reel 1 having improperly balanced color because of an error. All that was done to the scan for v1.0 to my knowledge (aside from a contrast adjustment) is being white balanced using the soundtrack on the film.
The new color correction being used for the in progress v2.0 release seems to capture well balanced and still very accurate color.