The name of the sensor suggests it's a succesor to the 3310... but that's probably not true. How does the performance compare to the 3310 though?
3320 is the public variant of the AM010 found in some of Logitech's stuff like the G302. Objectively, it has a lower max speed than 3310. Subjectively, some say it feels more raw than 3310. IIRC logitech said for one of the mice using it that it has zero smoothing under 2000DPI, but I dunno if that's something that applies to every mouse with it due to the shenanigans of the same sensor performing differently across different mice/firmwares.