Seat and supports are the same. The seat platform and the guard under the pedals were wider on the B, and that extra width means the pedal shaft/cam out to the right brake is also longer on the B. (A/BN were the same in all these respects.)
As others pointed out, the A won't have the brackets that mount to the platform and hold up the seat supports, as on the A/BN, that outer support mounted up to the final drive with some of the same bolts that hold the fender on.
Except for the front casting and grille (different cutout to deal with the different shape of the casting), and as long as you're not dealing with a differnece in the fasteners (Dzus vs. bolts and hooks -- earliest 70,000 or so tractors of both models were Dzus) for the hood and grille, pretty much everything else is interchangeable. If one of them is Dzus, there's also the chance that the magneto grounding is different. The early ones had a rod that operating a grounding tab at the magneto. Later (and most of them) used the single-pole mushroom cap switch to ground the magneto through the chassis of the switch.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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