We have been over this before you know . I insert from the film’s thread:
And Eastwood is not the first western actor wearing the same clothes in several films, any basically playing the same character in not connected movies.
True, but this is not the point here. Blondie enters the film in an entirely different outfit than in the two previous films. Then he is transformed throughout the film. His frock coat
and his straw hat are left behind in the desert. Then in the prison camp Angel Eye throws him a bundle of cloths, with the sheep skin waist coat and the hat [edit: and the denim shirt, I think]. Then in the scene with the dying solider, he covers the solider with his skin coat. Instead of retrieving it, he picks up a poncho. Only when he arrives at the grave of Stanton, he is fully transformed to the character we know from the two previous films. I think this is a pretty clear that Blondie the bounty hunter is in fact Manco the bounty hunter.
If Leone wanted him to be the same he could have named him Joe in all 3 films, but he didn’t.
But he did, at least in GBU. Throughout the script he is consistently called Joe