Well they have no contact with each other in the wild. Bonobos are a different species because a population of Pan became genetically isolated south of the Congo River about 800,000 to 1 million years ago. However, they can communicate well with each other in artificial settings. For example the bonobo Panbanisha was raised in a human-chimp-bonobo hybrid culture. I wrote about this last year. In my mind the biggest and most significant difference between chimpanzees and bonobos socially is the fact that chimpanzees seem to be more competitive (especially when a resource is monopolizable) and bonobos appear to be more cooperative (even when a resource is monopolizable). This general tendency causes both species to excel at different tasks. It is a little more complicated than that.. but I can link a few research studies discussing this if you are interested.