I've lived in northeastern Ohio all my life, and have never noticed differences in color between NBC's New York or Burbank studios when watching programs on that network. (Maybe there was better color processing at stations here in the Great Lakes region than at the stations on the coasts?
) That may have been because we didn't have color TV when I was a kid growing up in the '60s-'70s. The first color set I ever owned was a beat-up 1964 Sears Silvertone roundie with terrible convergence; I never could get it right, so never had much of a chance to notice color differences between different NBC studios or even between ABC or CBS. (Several years later, I had newer color portables--two Zeniths and a Sentry 2, and my present living-room set, an RCA XL-100 CTC185; I can't notice any difference in colors between any of the half-dozen or so networks now in operation on the RCA or the Sentry 2, and I never was looking for it on the other sets.)
Today, there is little if any difference in color on any network because of vastly improved technology, which is why today's color TVs don't have color correction schemes anymore like Zenith's old Color Sentry, GE's VIR, Magnavox's Videomatic, RCA's AccuColor and ColorTrak, et al. There is no need for color correction at the set anymore; it's all done automatically before the signal goes out on the air, so the colors should be as stable as the Rock of Gibraltar on every network. I know they are close to that on my set. I don't think I've had to adjust the color controls to any great extent since I purchased that TV nine years ago. I even shut off the auto-color control, as it isn't needed in the digital age.