Just an update, I did swap the transmission in with no problems, just a brake swap. Gear ratio is probably slightly taller to offset the shorter tires on the 1864. I could see no difference in the pumps.
Driving it, it doesn't seem to have any different ratio, so whatever it is off, it doesn't make any practical difference.
I have mowed a couple of times since the swap. It might not swap on paper because it isn't identical on paper but in the real world, it is an easy practical swap.
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