Yes, but why 
A500, A600, and A2000 have the same CPU.
Does A2000 come with FAST RAM by default ? That could explain the difference.
When I add FAST RAM to my A600 it is then equal to A2000.
yes master,
in sysinfo the comparison is for an A2000+fast ram that's because is faster than the A600 config surely was measured using chip ram only
idem with A1200 and A2500...you will see there both uses 020 at 14mhz however the A2500 is faster because was measured using fast ram
if you add fast ram to the A1200 will be even a bit faster than the A2500 due AGA chipset