well, there is a camp counselor in AmE too but I am not too sure about the clear distinction between those two.
Camp counselors lead and instruct children and teenagers in outdoor-oriented forms of recreation like swimming, hiking, horseback riding, and camping ( also in some more specilized subjects such as archery, boating, music, drama, gymnastics, tennis, and computers,etc.)
If I am not mistaken, a camp counselor goes through some extra training before becoming a camp leader. I am a bit fuzzy about those differences...