Can you take the quad core processor out of a Mac G5 and install it in a G5 with a duel core?

I simply want to upgrade my duel core G5 to a quad core. Is there a lot of work involved or is it just a matter of installing the second processor and fan? I have two machines and I can’t decide whether to remove everything from the duel core and put it in the quad core machine or if it would be easier to do the reverse and install the second processor in the duel core machine.
Sorry, dual not duel

Huh?
You want to take the processor out of one computer and add it to the other computer? You can replace the processor, but you can’t add a second one.

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