Well if you were in the US you could sue him for identity theft and then take his business...
Okay, seriously now. Since he's already established I would avoid using anything in your business name that could possibly cause legitimate confusion between the two of you.
Since you both have the same actual name there will likely be someone confusing the two of you for no reason caused by either of you, and that's okay and to be expected. It could even work to your mutual advantage at some point if you establish a relationship with him before hand.
But if a choice of name, etc. - even if you didn't intend to cause harm - incites confusion then you're asking for trouble and if it goes "official" you'll likely lose.
The copyright issue is interesting though and I'd love to hear from someone really knowledgeable about that. If two photographers named "John Smith" wish to copyright their work how does that work.