IMac 1920x1080 with external 1280x800 display

Hello,
In using a new iMac with it's native display at 1920x1080 (16:9) connected to a native 1280x800 (16:10) projector: Is there a way to keep the iMac's display native 1920x1080 res while sending a 1280x800 res to the projector? I am assuming that doing so will result in the iMac's display following the display port's signal of 1280x800, thus distorting the iMac's image.
Will I need a video scaler?
I want to send native resolutions to both the internal and external display to preserve quality. The two resolutions aren't compatible, though in aspect ratio they are very close, so the iMac's monitor will still serve pretty well in regard as a reference to what is projected, even though the res is different.
Thanks!

If the projector has the ability, I guess I could just scale the projector down to 1280x720 at it's input. Or, run it at full res and live with the thin masking top/bottom (if it has digital masking, otherwise mask the screen).
My real question stands as: can the iMac run it's native res and output a different res simultaneously? LOL...sorry, just thinking this through....

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