It depends on the type of the two LCD panels.
Seek the datasheet and match the appropriate pairs on each side. Just wiring. Be careful about the voltage (5V vs. 3.3V - I think both are 3.3).
The WXGA means longer CCFL also. It means slightly decreased backlight.
If even the driving methods (I think it must be lvds, but how many channels - usually three + clock) are equal, you have to face the problem of different resolution. You also have to modify the BIOS for this resolution and this is not easy at all.
If you are satisfied by a working windows, it is possible to set the resolution (if the driver of the video card supports) to the WXGA.