Shit you're right, the two bottom pictures are the at&t variant with the metalic strip. Still, it's the Xperia T.
The two bottom ones aren't the same either. The metal strip isn't the same, the front black plastic are thicker on the middle compared to the bottom one and it doesn't have that, what to say, diagonal bottom. And the large and small side button are reversed.
Not really that fond of Sony (and older Sony Ericsson) design though the original Arc (and S) was really nice and looking at those three pics you posted the bottom one do have a very appealing profile.
Edit: Had to go look up the phones in question and have come to the conclusion that the bottom picture is the Sone Xperia V. The middle one might be the Xperia TX. The Xperia V actually looks very good even from other directions and do have that 342 ppi 1280x720 4.3" screen. Had I been looking for a new phone it might have been an insteresting contender.