Interesting, right after I posted this I thought "Oh just ask Apple Support" so I got on a chat with them and was quickly told that this question has come up a lot since the release and there are definitely hardware differences between the older "Airpods Pro (Gen 2)" and "new" Airpods Pro 2, though they could not detail any of the differences for me. Clearly even Apple's support people can't keep them strait. :)
It seems they definitely have not always called them "Airpods Pro 2" as you can find older spec sheets from Apple calling them "Airpods Pro (2nd generation).
AirPods Pro (2nd generation) - Technical Specifications - Apple Support
Either way I appreciate getting the correct info here! I was thinking of upgrading from Airpods Pro to the "new" ones but since they aren't actually new, I'll wait for the next version.