The only two things in common between the two are their names (frame) and their material (steel) and perhaps a few rivet sizes.
Yes very different but you can mount a 32 truck cab on a model a chassie . You'll have to use the model a fenders and box. I have a friend that did this many year's ago and looked great and gave him a bit more room in the cab...
Huh? Mounting the '32 or '33/34 cab on the A frame is not going to provide any more room in the cab than it would on the correct /32 or '33/34 frame.
I took this to mean the '32 cab provided more room than an "A" cab.