Comment by davidferguson

And it was made by a lab that made choices on processing and developing times, that can quite easily affect the resulting image. You hope that labs are reasonably standard across the board and calibrate frequently, but even processing two copies of the same material in a lab, one after the other will result in images that look different if projected side by side. This is why it's probably impossible to made new prints of 3-strip-cinerama films now, the knowledge and number of labs that can do this are near zero.