So i have a traxxas 2242 model controller and a 2218 receiver i run in my blitz. Works perfectly. So i got another truck and bought another 2218 receiver for it. For some reason the brand new receiver wont link to my controller. I called traxxas and they sais the controller and receiver are not compatible which is weird because the identical receiver in my other truck works fine with it. Any ideas?

My blitz is running a castle brushless system and my slash has the stock xl5 and titan fyi.