what is dealing with your EDID management?
Check the EDID settings on the Matrix - ensure that they are the same...
Also check that the refresh rates and resolutions are the same

Both (ALL) outputs should be set to Generic RGB Profile in system preferences.

Also check that your mix window settings are the same between servers.

Are both Macs the same generation / OS / software etc
Unusual to get a significant difference between 2 identical setups - but not impossible...

Send a copy of both catalyst PDF profiles if you cant solve it...

S