There is only one size, 41mm with a 1.2" display, and the design is unchanged from last year. There are a number of improvements on the inside, however.
The Pixel Watch 2 is a little better in every way
Google Pixel Watch 2 review: Google really did it
Google's Pixel Watch 2 will reportedly have significantly improved battery life
Google Pixel Watch 2 Review: An Impressive Sequel
Pixel Watch 2 shows up at the FCC, but it's missing a previously rumored feature
Google Pixel Watch 2 might go official in 2023: Here's all that we know about the wearable - Smartprix
Google Pixel Watch 2 Could Have Faster USB Charging Speed
Google Pixel Watch 2 launched in India: price, specifications
Pixel Watch - Wikipedia
Pixel Watch 2 specs leak shows big improvements over the original
Pixel Watch 2 Gets 4 Exclusive Watch Faces - Here's What They Look Like
Google Pixel Watch 2 is a Fitbit Loaded with AI Technology
Introducing the Google Pixel Watch 2: Upgraded Chipset, Better Sensors, and More
Google Pixel Watch 2 review: better the second time around