http://www.ihcubcadet.com/cgi-bin/di...s.pl?pg=topics
Look at the Wiring Diagrams between the two tractors. My guess is the safety switching within the switch is a bit different Things like ' with PTO switch on, can't start tractor. and Seat switch not active then PTO can't be engaged. etc. When I made an entire new harness for my 782, I bypassed the safety switching that ran threw that switch and just have a single pole single throw switch to power the front pto.
Look at the two wiring diagrams, maybe you can make the switch you have work .