Yes, google sees them as different links and yes, as 3 different links to different pages on the same (sub)domain.
Google even sees a difference in domain.com, domain.com/index.html, www.domain.com, www.domain.com/index.html, at least they index all those versions if there are links in the 4 styles, dupplicate content...can be easily avoided with a proper htaccess setup, but that's a different question.