I suppose it could have used a different bulb, or different telecine calibration settings, or something like that. The problem with the mthr bootleg is that the chroma signal is corrupted from multiple generations of copying. If only we could find a higher-generation copy of *that* transfer...

UPDATE: I found that if you simply turn down the color saturation on the raw mthr bootleg, you can get a better idea of what the color balance is supposed to look like:

Still a little pink, but I will remind you, telecine machines were intended to get the best image on videotape, they would have used a different light source than a projector of the same time.