More like a "neo" Okinawa-class, like a top-secret experimental frigate, or more like an Okinawa-class refitted with alien technology. Considering the nacelles, with another retexture it could potentially be more of a stock Mirak/Kzinti-refitted Okinawa-class (or captured, if Feds and Mirak/Kzinti were enemies in the 23rd century).