Magicool has 120/140/180 rads that have the same or similar cores.

The chart should really be labeled 'frontal area' IMO, as 'surface area' confuses the issue a bit since technically the surface area is all the heat dissipation area (i.e., all the fin surface area) added up, which obviously varies considerably with FPI and thickness.

There's a lot more to performance than comparing either frontal area or surface area, since e.g. tighter fins require considerably more air pressure, and fan performance in general, among other things. So I'm a bit skeptical as to the absolute value of the chart; at best, it might give you a ballpark of relative performance.

Also, re: mayhem's comment that deadzone area goes up with rad size - in absolute terms, of course, but not as a percentage. The ratio of deadzone to swept area stays the same. However, I can see it requiring a deeper shroud to fill out those deadzones with a bigger rad vs. a smaller one. So in practical use, a bigger rad is likely to have a larger effective deadzone (unless using a deeper shroud to compensate).