They are interchangeable, but not plug and play, it will plug right in and fit, but your going to need factory wiring diagrams for both, as I am pretty sure a few pin-outs have to be changed (which you need to carefully do as sometimes pins can slip out if you bend them while swapping them, which could lead to a wire coming out once you are done, which would have you removing it to fix), I also think you have to run a wire for the tach, and the coolant sensor, which you'll be needing to get different oil pressure, and coolant temperature sensors, since those gauges are most likely going to have resistance values a bit off from one another, so the gauges would be off if those are not changed.
I tried to find a wirte-up, but only found a similar video where a guy could not get his to work because he was not willing to rewire a few things, so it was not really helpful.
Hopefully rjolly can find those wiring diagrams, or a write-up for you.
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA