They're the same thing... one is the model name (CL-65) the other is the marketing name (CRJ-200) - slightly oversimplifying, but essentially accurate
Here's a link to the same discussion from a few weeks ago:
http://www.flyertalk.com/forum/showt...highlight=CL65
and a thread from airliners.net:
http://www.airliners.net/discussions...L-65#ID3735694