there is a thread on HT, that has pictures of all the different b-series cams..
the ends of the cams (the dizzy side), all have very distinguished marks, to tell the difference...
i will try and find it for you, and post it.
there are more, that was jus the first one i found.
http://www.honda-tech.com/zerothread...ostid=27777609
http://www.honda-tech.com/zerothread?id=1290946