06-08 are the same.
09+ are different. The 09+ flow better than the older ones, I see no reason to put a Magnum intake on a 09 Challenger. They will not bolt right up without spacers/modification as the ports are different.
There are at least three different intake manifolds for the 09+ 5.7L as used in the Charger/Challenger, the truck and the Aspen. One has active, variable length runners, like the 3.5L...