There is a difference between the Hyper 212 EVO and the Hyper 212 LED. Almost everyone says there's not, but you might want to know that there NOT metal gaps between the four direct contact heat pipes in the Hyper 212 EVO, so it seems like a smooth copper surface. On the other hand, there ARE metal gaps between the four direct contact heat pipes in the Hyper 212 LED, so people say it creates a rigid surface rather than a smooth one.
However, I am not sure if the gaps between the heat pipes affect its cooling performance.