If the isight camera is connected via a usb cable built into the macbook pro model laptop then you should be able to take it out of one machine and move it to another by just wiring the wires to the internals of the other laptop.
But if it isn't a usb cable and some sort of ribbon cable which we know apple loves to use you might be in trouble.
I haven't take apart a MacBook Pro, but a macbook isight is connected via USB that is part of the video data cable, which isn't FFC, but micro-coax.
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