Its kind of hard to tell, I can't get a good sense of scale from the top pic, and I always thought that the Space Jockey was much bigger than a human, like 9-10ft tall. From here I can't how tall that guy is?
.....Actually from these Alien screenshots:
The Jockey seems even bigger than I first thought.....and that guy in the pic you posted looks pretty big.
:/ I dunno. Am I the only one who thinks that kind of sucks? The Space Jockey was always very creepy and 'unknown' and to find that its just a humanoid giant in a suit feels like a letdown. Even if that humaniod giant is an alien himself.
On top of that the Space Jockey in Alien definitely looks more organic than the one in Prometheus. Like maybe the 'suit' is somehow biomechanical which would account for the fossilisation but....gah. I just don't like it