The version properties for the dll and mDNSResponder.exe in my installation of WXPProSP3 are both 18.104.22.168. These would have come with iTunes, although AFAIK they have not changed for some time, e.g. 2011.
Where'd you find a standalone installer for Bonjour that is 2.0.2? Yes, that feels really old.
Ah, "Bonjour Print Services"--I didn't even know there was such a thing. I have only ever used Bonjour for syncing.
So you probably got v22.214.171.124 with iTunes, but for Print Services there's a different version of Bonjour. The question remains I guess, does the v126.96.36.199 that you get with iTunes also do Print Services? I'd guess not; that you need both. Dunno myself though.