They are the same species as Charapita, C.chinense. Other than that Charapita is Peruvian, Cap 691 is Brazilian. There are certain similarities to the flavours, no question, and the heat is also quite similar. Personally, I prefer the flavor of Cap 691 over Charapita by a good margin. I still really like Charapita, though!
Thanks Nigel. Well I love the flavour of the Charapita, so if what your saying is true, I want in, Lol. Does 'Cap 691' go by any other names, gonna search for it....