The hardtop/ Barracuda vent windows come to a point at the top, the convertible metal frame has about a one inch flat portion, the only hard part that is different is the frame and all other parts, window & such, are the same.
here's the difference
I had a convertible top pot metal piece and used a hardtop vent frame (a lot nicer than the pitted nasty latch and rubber convertible piece)
worked pretty good for me. View attachment !!!ventwindow1.jpg