Not sure if “2011” is a trademark, but that is particular to STI and SVI. In the STI case, it uses a steel frame insert and polymer “grip”.
There are other double stack “1911” makers. Kimber did at one time, not sure if they do. Wilson Combat, Rock Island, Para (now Remington). Probably a few more I am not thinking of.
Thicker magazines, trigger bow, magazine catch, and safety I think. The other parts are usually regular 1911 (sear, etc).