Problem with MacPro and Cinema Displays

Hello Community

I have a strange Problem with my macpri (early 2008) using Lion 10.7.5 and 2 CInema Displays (20")

The displays are exactly the same, but when i go to settings -> Displays and want to adjust the colors (because the left dsplay has not exactly the same color settings as the left one) there ate not the same settings to choose!e "Cinema Display" which is the option i want to have enabled, but on the right screen there

On the left one i can choose "Cinema Display" and that's the option i want to use... But on the right screen there is np "Cinema Display" only "Cinema" (as you see in the attached photo...)hat way? and can i fix it?

Why is it that way? and how can i fix it?

Thanks for any help!