Damon Lindelof says the film will NOT end with the derelict crashing on LV-426. Fine. That doesn't mean the ship seen crashing in the trailer
isn't the same ship, though--it just means the crash happens earlier in the film, and the finale perhaps moves on to a different location.
At any rate, here is what we can explicitly gather from the trailer:
The ship ends up in the exact same position as the derelict in ALIEN:
It's highly unlikely that a ship that looks virtually identical to the one in the first film would crashland in a prequel to said film, come to rest in the exact same configuration, and
not be the same craft. If this turns out to be the case, that's a really annoying, pointless bit of fan teasing.