I don't think they will. The CAD mechanism uses a sliding collar with internal splines to engage/disengage the axle halfshafts (on the pax side,) and you'd either have to weld the two halfshafts together (which will likely get you something that is grossly unbalanced,) pin them together (which will likely be relatively weak,) or put the collar in place and weld the whole thing together (harder to balance, and I don't know as the collar will fit in the ~CAD housing - tubes may be too small inside. IIRC, the CAD collar is removed by removing the shift actuator, pulling the outer halfshaft, and then slipping the collar out through the shift actuator port.)
The later rigs do use larger joints, but I don't think it's limited to ABS. The later shafts should fit neatly into the earlier ~CAD housings, but I don't recall if the hole in the outer knuckle is large enough to pass the larger joint. However, you should be able to swap outer knuckles as well without too much trouble.