This does not worth making a post in the reputation board because it is simply a distraction. I will advise the OP to lock this thread because there is no point in it. I do not know when it became an offence to use the same username in different platforms that will warrant it creating a thread in reputation board. It is obvious you don't even know that reputation board is for people with questionable character in the form of violation of forum rules. Several usernames in this forum are similar and there is no issue with that provided there is no violation of the forum rules.
maybe because there is a similarity in the use of the username that makes suspicion. Op is actually not completely wrong. but he did not include strong supporting evidence for his accusation. it was just an assumption or possibility felt by Op from the catch he got.
if Op cannot present additional evidence or if other users add evidence. this accusation thread will not have any meaning. then it would be better to lock it for now and Op can reopen it when he gets stronger evidence.