I can't say that with absolute certainty, but the toe box top didn't change, the blower motor didn't change and the air inlet hole location in the hood didn't change. One thing that is definitely different is the location of the ECU. On the G2, it moved to the driver's side and there's a side-inlet flapper valve under the outboard side of the plenum where the G1 ECU was.
The crack doesn't look too terribly bad to me. The plenum box top appears to be riveted to the lower. You could separate it, Super Glue the cracks and gorilla tape the inside. Then, re-rivet the assembly while you continue searching for a good one.
If you know anyone else around with a G2, all it takes is 2 Phillips screws and 2-10mm bolts to find out for sure if it might fit. Swapping is a piece of cake. You may be able to block off the side hole until you source another one.