Some very minor styling changes and they're making the barrels out of something they're calling 'Steelium'. Wouldn't surprise me if the DT-11 used different chokes than the DT-10.
According to their U.S. website, you can't get a stand alone DT-10 trap gun. You can only get the combo. So, if you want a DT for bunker or just doubles, you may have to go with the DT-11. And, also according to the website, the DT-11 is not available in the U.S. So it would be interesting to see what Beretta's response would be to an American request for a DT- bunker gun. The Italian Beretta web page indicates that the DT-11 trap (bunker) gun has fixed chokes. You'd probably want the sporting model if you want screw-ins.