Comparing the landing distances of the 747 400 and classic “at the same weight”, as you suggested, would only add support if they are landing at the same speeds. Not being informed on the 747 series, I’ll not comment on any different wing aerodynamics that may or may not affect landing speeds.
I can readily find:
747-400 Vref = 140 KIAS at 250,000 Kg
747-200 Vref = 140 KIAS at 240,000 Kg
So, the difference in "wing aerodynamics" => 10 tonnes for 140 KIAS approach.
At 140 KIAS approach, 747-400 landing distances (including 1200' air distance):
Autobrakes 1 = 8100'
Autobrakes 2 = 6800'
Autobrakes 3 = 6000'
Autobrakes 4 = 5000'
Autobrakes Max = 4200' (close to max manual braking)
I cannot readily find a similar chart for the 747-200.
Please provide similar info for other aircraft at 140 KIAS approach.