I remember the first Whos Who treated them as the same. Not long after D.C. noted that perhaps they should have added separate entries for the two. I do not know if that was ever addressed. It would be interesting to see them meet. My opinion is they were two separate beings. With all the changes since then it is nigh impossible to make distinctions on Superman origins. I suspect the people on this board might be up to the task.
I thought that the COIE made it that he was now the rebooted version, and that new earth, and then the latest revamp made him orph all prior versions into who he is now>