Here's the rundown on the figure sizes:
Jungle Hunter: Same body size as before new articulation added no shared parts with AVP. Added articulation = ab crunch, ball jointed waist, turn joint at bicep, double jointed elbows, gauntlets are separate sculpt now which added a turn joint there.
City Hunter: Same body size as before new articulation added no shared parts with AVP. Added articulation: ab crunch, turn joint at bicep, double jointed elbows, gauntlets are separate sculpt now which added turn joint.
AVP: Larger scale same articulation as Ultimate JH and CH but the leg armor is sculpted separate and can be removed unlike JH & CH. The articulation is also hidden better because the articulation was sculpted into the sculpt and with JH & CH the added articulation was added to the sculpt.
Hope this helps 2 differnt height sizes and no shared parts it would look silly.