https://www.novak-adapt.com/knowledge/transmissions/manual/

The 465 has some fins or webs cast on the case, the 420 is pretty smooth.

PTO should fit any of same model transmission it is removed from.

For interchange between models, if any, check PTO manufacturers literature.
PTO openings are pretty standard, same bolt patterns. But often need a different driven gear in the PTO for different transmissions, even though the PTO case may seem to bolt up.

Also be aware there are many different kinds of PTO’s for different uses.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-