Yep, same guy. I knew from the teaser preview what was going on. My ending was different (as was the killer*), but the rain cutting folks off from leaving was the same, as was a bunch of strangers being forced together in a structure (mine was the gothic classic of a house on a hill...and for those that know the twist in the story, you see why that makes sense ;) )
Hell, it's been a few years, maybe I'll go ahead and write it.
*Spoiler for Identity, don't read if you haven't seen the movie:
My inspiration, years ago, came from studying MPD and wondering what it'd be like for the various personalities as a doctor "pruned" them.