2 identical monitors, with same color profiles, displaying different colors...

Hello Richard,

Thanks for that info and for choosing the Apple Support Communities. If I understand correctly, you are having an issue with identical external monitors displaying different color settings when connected to your MacBook Pro. You can figure out if unexpected behavior is related to a user file or setting by trying to reproduce the issue from another user account. This process includes creating a new user account, logging in to it, and testing for the issue.

How to test an issue in another user account on your Mac

Next, use the steps in this Apple resource to use the ColorSync Utility app to help repair color profiles on your displays:

Check and repair color profiles in ColorSync Utility on Mac

Cheers!

Thanks for replying, Richard, and that additional info, it really helps! Since you're still having this issue even after using the ColorSync Utility, your next step is to contact Apple or go to your local Apple Store or Apple Authorized Service Provider for further help.

Contact Apple Support 

Have a great day and thanks for using the Apple Support Communities!

you mention nothing about where these two are connected. What ports & where. That's important to not overload the bus.