The current Superman has more claim to that title than the Earth-2 Superman - HE'S the one with the unbroken line of descent from Action Comics #1 to now. The Earth-2 Superman is more similar in powers - still not that similar, even so, and he's influenced more by the Earth-1 Superman of the 60s and 70s in his character - but he is a distinct character, created in 1969, as Interrobamf says.