B747-300
1983
three crew flight deck
MTOW 377t / MLW 285t
range 11500km
wing span 60m
B747-400
1989
two crew flight deck (digital, 6 CRT displays)
lower basic empty weight / MTOW 395t / MLW 295t
range 13000km
new engines
wing span 64m
first airliner to introduce winglets (3% fuel mileage improvement)
recontoured wing to fuselage fairing
weight savings (floor panels, graphite composite / wing, alluminum alloy, 1900kg / carbon brakes, 900kg)
new interior (increased passenger stowage capacity)
I am sure there are a lot more!