First of all Welcome to the Tractor Forum Jeff!
MFreund gave good info regarding the different 3pt hitches.
The only thing that puzzles me is why the implements won't fit the Cub. When I looked up the specs on a Cub Cadet 8454 is showed either a 35 or 45 hp diesel and class I/II hitch. This is the link I found. http://www.gspike.com/new_vehicle_detail.asp?veh=20509&CatDesc=#detail
I always thought the Ford 800, like the older 8N's had a standard class 1 3pt. It that is correct than the implements should fit.
Maybe the lower lift arms are different width so maybe you need to reposition the lift pins on the implements. This is done by unbolting them and reattaching in the other position. If they pointed out before reverse them to point in if the Cub lift arms don't spread far enough apart to allow you to hook them up.
I had to do that when I got my Woods finish mower to attach it to my little Yanmar.
Maybe if you posted some pictures of the implements and the tractor it would help us understand the problem.