The "2011" design has been around for sufficient years for the design to go off patent - its' gone the way of the 1911 or AR15 - multiple manufacturers are coming out with their own version. I wouldn't be surprised if some of these are job shopped under a BATFE variance for the markings.
The metal grips that have largely supplanted plastic ones were designed more recently which is why each vendor has a slightly different style. There have also been separate evolution of variants since the the original SVI/STI split. SVI has added the interchangeable breechface years ago, recently added the internal extractor (no ugly cut on the side of the slide), and now offers "zero take up triggers" as an option.