Did you switch the monitors to see if its the signal from the pc or the monitor itself? Thats the first thing we need to know.
I find in my system that eyefinity turns my center monitor to a slightly warmer color temperature for some reason, its not present in landscape or single monitor mode so I know its the signal.
But I had to send back 2x Dell U2410 because they had color tint on them, goes to show not all monitors are equal even if they are the same brand/model so if you determin its not the signal from the pc causing the color change and its the monitor itself the next step is to try and fix the color difference with the hardware settings for the monitor (change rgb values, contrast, saturation, etc) after you have that as close as possible, do any minor tweaking via your video card control panel.
If its still not even close after that, you need to send the monitors in for replacement for being defective.
The other thing is that you may just have driver issues, if the difference is as bad as you make it sound it could be a driver related problem.
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