They are both 2001. My Son has a radio in his 2001 non monsoon going bad. He is a purist and doesn’t want an aftermarket radio. I have two monsoon radios in my box with codes. One is a 2001 and the other a 2002 both have same part numbers, hence my questions.What model year are the non-Monsoon New Beetle and the Monsoon radio? This might change the answer.
In my cars I installed a nice alpine unit and most happy with them. My son wants to keep the original VW radio look and I haven’t been able to talk him out of it…yet.I believe the radios will work swapped but if Monsoon unit is installed into non-Monsoon vehicle you won't get the "better" (and I use that term very loosely) premium upcharge Monsoon sound. The "amp" really isn't much of/if any amp, more of an elaborate crossover system. There are no large gauge power wires feeding the "amp" but rather a multitude of small speaker wires and the Monsoon speakers have lots of wires from my recollection.
Do yourself a favor and install most any modest priced headunit and enjoy more features and the "upgrade" will really wake the speakers up.