#1 Rearend ; Different
#2 Transmission ; Different
#3 Enghine: Almost the same, if not. The only difference is the heads and cranks and pistons in the wd-45.
#4 Electrical: Generator and lights look to be the same, control and or light switch are different.
#5 Body: Front grill and maybe steering box are the same.
#6 Tires: Are close to the same sizes 12 * 28 ( 13.6 * 28) Back, 5.50 * 15(6.00*16)front
#7 Rims : Not the same WD back rims had rails to move in and out.
There are more things that are different than are the same. They are A C and about the same size and horse power. Between the hand brakes ( how you can steer and use brakes ( a lot of hills here), drive is why I've got one setting at the end of the field). The pto is different to if the WC has one on it, I do thinK some of the WD came with the snap connectors, well wrong there. Stopped and look at the maunals no snap couplers, only the arms for the plow and other attachments etc. In my opinnion the wd was a great improvement and I'm running 2 right now and working on a 45, and got one more WD to bring home. I think if you take a care of them. They are one of the best made tractors for the money, the WD .
Have a Good One !!