Hi BM, no, not in the literal sense....if you mean the nuts and bolts; yes....but the 20" machine has an 8 blade cylinder reel versus 6 blade for the 17", a 20" soleplate and bed-knife blade; 3 segment rear roller versus 2 for the 17", a 20" chassis, longer clutch engine shaft, a 20" front roller and roller frame, a 20" catcher and a larger engine on the early machines.
At present, most common parts are still available, after market. wink
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin