Re:
http://movies.trekcore.com/gallery/albums/xi/screencaps/prerelease/aaaaa4.jpg
You may be correct. But take a gander at the second one on the right. It is definatly different.
ETA: And the third one up on the left.
Again, as others have pointed out - there are only two types of shuttles in that picture. That's it.
- On the left, #1, #2, #4, #5 (lifting off) - and on the right #1, #3, #4 -
these are all the same type of shuttle. (boxier with high nacelles, slightly larger)
- On the left, #3, and on the right #2 -
these are all the same type of shuttle. (rounder and low-hung nacelles, slightly smaller)
Also,
the takeoff picture with SF in the background shows one shuttle of each type.
Both of these shuttle types are fairly large, and of similar size.