This is the HomePod full size, not the Mini; the power cable is a standard power cable... not a USB-C cable.
Differences vs. version 1 that I can see:
* Thread Hub capabilities
* Ultrawideband chip support, for locating devices
* Fewer microphones/speakers compared to v1
* Slightly lighter? Probably from fewer speakers.
Notably, the V1 HomePod was discontinued... so not a lot of that matters. You haven't been able to buy a V1 HomePod for awhile now.