vent windows and frames

A question was checking inter change in Hollander manual They show the vent windows on 66 B Body interchanging with numerous yr up to 70 . Does that mean the frames are same also or only the vent windows . Thanks

I believe that the frames are not the same.66/67 have a different part# than 68-70 frames.Also,I checked Tony's Parts.He has the repro vent frames and his application shows 68-70 only.