I assume you don't have them side by side to compare so maybe the SV ones simply a tad wider.
What the previous fella said might be right but really, there's more science to it than just the physical size, tubes diameters and so how flow capacity is affected. The amount of finning between the tubes and the spacing of the passages between the finning affects performance.
I have a Husqvarna 4 stroke dirtbike. I've replaced the radiators, (smashed the origionals),and I learned Husky sources them from 3 different manufacturers. The replacements I got, while the same physical size, had two less tubes. But as a result of that they also had more space between the tubes and so more finning.
Nothing changed about the cooling requirements of the bike, just two different methods of acheiving it.
Dave