From what i know of there are only two: Ab Carver and Ab Carver Pro. I had the same question and researched. To be completely honest the Ab Carver Pro's quality was updated and that is it. The Handles, the Carver, and color. Everything else is the same.
answered 5 months, 2 weeks ago
We only have two models and they are the Perfect Ab-Carver and Perfect Ab-Carver Pro. We currently do not have an Elite version. The Pro version comes with a knee pad and the handles have an overlay of rubber which provides a better non-slip grip. The other major difference between the models is color, the Pro is black with dark red accents and the Carver is gray with white accents.