I did several tests and I must say that if you use bar color monitors are almost identical.
Differences known whether the use Final Cut Studio, because the GUI is gray.
On a gray screen tends to yellow, the other not.
I reduced the green and red up to 95 and I have partially resolved even if a slight difference yet.
In the past I had two Apple Cinema Display, and two Samsung monitors and using as background images in Apple white and black was always the same problem, despite having two displays are identical, as revised and month of production.
Thank you.