I’ve read interviews with Clint from ages ago, and from books dealing with Sergio Leone, and technically he’s not playing the same character in any of the three movies. These were just such low budget affairs that even most of the costume that he wore was actually his Rowdy Yates outfit including the guns, holster, shirt, pants, and hat, aside from minor additions here and there. Calling them the Man With No Name trilogy was a Hollywood affectation once they were brought stateside, even though he has a name in For A Few Dollars More (Manco). Eastwood himself confirmed they are not the same character in a couple books written about him. Leone also wanted him to play the lead in Once Upon A Time In The West since they worked so well together, despite neither one of them speaking the same language, but by that time, scheduling conflicts made it impossible, so Charles Bronson got the part. Not sure where that movie would have fit in if he was playing the same character.