I just looked through both of their profiles, it seems to me that there is not enough information to conclude that they are the same person and you very well may be harming the reputation of a completely different person that had nothing to do with your deal.

From what I can see their typing styles are different, their "Bump" posts are different, capitalization, words, etc. are ALL different. You are seeing what you want to see, because you are blinded by anger.

From the scam thread you posted about the other guy, I'm not even positive you were scammed by him, let alone that user and OP being the same person. I have not given him +rep, I've given a review of the negotiations/process as I have experienced it so far.

If you take the necessary precautions you will not be scammed, if you do not then there is a chance; I am not willing to take this chance, and therefore regardless of if they are the same person I will not be caught up by his scam. I protect myself and treat each deal as a separate instance.

If you have further proof that they are the same person I would be willing to take a look and revise my statements, the same goes for the scam accusation. However, as I see it right now; OP has not acting in anyway that would be the warning signs of a scam. He insisted on Escrow, OPSkins and never even implied that he wanted me to send first or anything else that would put me at a security risk or put my items in jeopardy.

Protect yourself as if everyone is a scammer and you won't have to worry about making those judgement calls or loose associations you are attempting to make.