To my understanding, the 318 mag cam was a tad hotter than the 360 mag cam. What did change on the late year 360 mags was the divider was raised in the kegger intake.
This is what I have seen also.
I have read articles that said the 5.2 cam could be used as a mild upgrade over the stock 5.9 cam, and this agrees with what 318willrun said.