I never rode the sea cabs. So I cannot comment on the differences. I will be interested in to hear that also.
The clamobile is a VERY slow ride. If I had to describe it I would say they are a cross between a doom buggy and a part of a parade float.
Imagine a doom buggy, only no lap bar, high upper back arched and curved, shaped like a shell, with smaller version as the matching front that covers the leg area. You can almost imagine the clamobile on top of a parade float with Ariel waving from it. Very bright vibrant colors of deep coral, pale coral and light and dark greens. Some clams are all the shades of coral. Some have the green on the outside.
The track winds snake-like a little. But no sharp corners, drops, turns, etc. The clamobiles always face forward. They are very close together, side by side, all facing the same direction.
Continuous moving track, usually. When we were on it, the ride did nearly stop a few times due to loading and unloading wheelchairs. The ride just slowed to a barely noticeable moving crawl during this time. On the clamobiles for wheelchairs the front of the clam swings opens like a door.
Very dark area, except for what is highlighted, which is quite a bit.
It is very well done. And I think adults will enjoy the ride, if for nothing more but a cool relaxing place to sit.