Hi Jr.,
I think the changes made to the ride during its conversion to the Crypt were fairly minimal. I think there were some ancient artifact-like props in the queue that were replicas from the movie, and there was also a pre-show that tied the ride into the movie and set the story. I don't know much about the story, but I think the ride is supposed to be like an extra part to the actual movie's plot (wherein you get to experience the movie yourself so-to-speak).
It seems like all of the effects, sounds, music, and props on the ride itself were not changed (at least not noticeably) from the original incarnation. Of course, the entrance was also changed to reflect the new name.
The thing about this ride, not unlike most of the former Paramount rides, is that the theme is virtually unchanged, only the immediate Paramount references and names were removed. Also, the restaurant currently known as Trail's End Grill was called Tomb Raider Grill during the ride's premier until Cedar Fair's purchase of the park.
Also, I definitely recommend you try this ride. The effects are great; an amazing theming feat for a flat ride. I wish I could have gotten the chance to try Kings Island's indoor version before it bit the bullet, as that would have made it almost dark ride-esque.
Also, it's worth noting that the restraints on this ride can prove rather...erm...uncomfortable for us males, if you know what I mean. Be sure to wear your cup!!