One of these phones is the Sprint Nexus S 4G. And the other, well, is just a plain old' Nexus S, no Sprint, no 4G. And to be honest, we've forgotten which is which. OK, we haven't forgotten. The third-party launcher and notifications on the phone on the left should give it away. Point is, aside from the Nexus S 4G being on Sprint and having 4G data, they're exactly the same phone.
The Nexus S 4G will be available sometime this spring for $199 on contract. We've got a few more pics after the break.