Changes since 1980:
Rake adjustable rudder castings
Better rudders (providing the newer one does not have plastic rudders)
H-20 Style tiller connectors
Better sails (not just age difference - they're made better)
Integrated traveller tracks front / rear
Beefed up main traveller
Jib traveller / cleats that actually work
Low-profile mainsheet system
One-piece cast gudgeons
Lighter (320 vs 340 lbs)
Integrated jib traveller turning blocks (in corner casting)
Euro-style rifled corner castings (keeps boat stiffer longer)
Comptip (no reef points, halyard hook is the same)
Longer forestay / shorter shrouds (more mast rake)
Trampoline is heat welded, not sewn
Plastic coated standing rigging
Jib is cut for more mast rake (shorter on foot, longer on luff)
No boom vang attachment (not used anyway)


That's all I can think of right now.