He means their personalities. I wouldn't quite say they are the same, but their methods of doing business were close. If i remember reading somewhere, a turncoat in the Gambino family during Gotti's reign said that alot of the influence Gotti had was based off of The Godfather, which, from seeing the movies, I would say was based off of the second one and the end of the first one. Needless to say, Capone seemed more like the blood hungry mobster, while gotti was more wealth and power killing who he had to in order to get it.