I am not that knowledgeable but I have had some treatment with ERP, but not full CBT. I am better and it has helped me but I am now being referred for CBT because the cognitive stuff is inportant as well. I feel for me, i need to do this to make a full recovery
i think ERP is used as part of CBT but CBT includes the meaning behind the OCD as well.
i am sure someone with more knowledge will explain this more fully.