So, after seeing numerous side by side comparisons of iphone 13PM and 14 PM on youtube and comparing new iphone 14PM to my old iphone 13 PM.
I can conclude that iPhone 14PM is calibrated on warmer side. Check here after 8:13 mins onward, the host has same observations.
Some of the screenshots of youtube videos, and my own comparisons are attached for reference.
You notice it only when, two phones are compared side by side.
So my take, as long as the screen is uniform; do not go into futile exchange loop.
Chill.