The half-rib DTS is the highest overall, the Pro-rib is second highest at the breach end, then the standard trap special, then the lowest Unsingle is the ACS version and then comes O/U ACS ,sport. skeet.
The Pro-rib has more taper rear to front and to give a potentially higher POI.
I think they are all "trap specials", even the ACS unsingle, and the overall height is not always the main factor in matching POI.
Matching the DTS O/U with an any unsingle might require comb height change.