I guess you would call it a hobby.---I have 1 JD 210--- 2 JD 212--- 1 JD 214--- 2 JD 216--- 1 WHEEL HORSE C-160 AUTOMATIC.
All the JD tractors will exchange anything part for part -hook up and all--- AND ALL MOTORS WILL MOUNT IN ANY OTHER TRACTOR.
-there is only one thing the 216 is a 16 HP engine and the head has more bolts than any other of these other tractors ---so I would think there may be some other parts in the engine that might not fit the others ---But I know of none as of now.
I also have a 32HP RHINO--Benye 284-6 Tractor with FWA AND FEL, Tiller, Box Blade, Harrow, 91" Finish Mower----Now this is my go to tractor.