CRCN and CRAHN are both "cognitive radio", and will definitely conflict.
But then again, you can just setup some more ns-allinone-2.31, and test it yourself:
I.e. you can have as many ns-allinone-2* as you want, installed at the same time.
But : Do never add any *PATH text to .bashrc . Not required.
CRCN info http://www.linuxquestions.org/questions/tags/crcn/