How Multiple Video Cards Work?

Let's say I buy a MacPro with 2 video cards and I name the outputs 1 through 4. I want outputs 3 and 4 to mirror output 2, but I don't want to have to run output 2 at the same resolution as outputs 3 and 4. Is this possible?
From output 1 I want to output 1920x1200 (Dell 24" native resolution)
From output 2 I want to output 1920x1200 (Dell 24" native resolution)
From output 3 I want to output 1024x768 (Projector native resolution)
From output 4 I want to output 2560x1600 (Dell 30" native resolution)
This installation is for a church auditorium where the computer operator will have a left and right computer monitor. There will also be a projector and a confidence monitor.
Any insight into how you can assign video to different monitors will be helpful.
Thanks,
Chris

If you mirror displays 2, 3 and 4, 2 and 4 will only use a 1024 x 768 section in the center of the display, with a black border filling the rest of the screen.

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