In my experience with measuring display characteristics (research lab working between computer and human vision), this is typical. One device we've worked with

In my experience with measuring display characteristics (research lab working between computer and human vision), this is typical. One device we've worked with a couple of years ago, also with OLED, used different panels depending on the regional version, European or Asian. The spectra were measurably different, but visually there was only a very slight variation in color temperature. Most of these differences can be adjusted for in software, which would be trivial considering Apple's competency in color science.