U2410 and U2412m Color Differences

Hi all,

I have had a U2410 for a while now and recently got a second monitorr (a U2412m) to use with it in a dual monitor configuration.

My problem is that there is a very significant color difference between the two panels, even when viewing mostly-white web pages such as Gmail. Currently, I have my U2410 in Adobe RGB mode and my U2412m in Color Temperature (6500K) mode. To me, the U2412  appears to be more accurate color-wise. Are these panels supposed to be that different?

I am using the same brightness/contrast/sharpness/gamma settings on both panels.

Any help/suggestions are appreciated!