Don't know for sure, but the 300 has to be a big fat "no" - it didn't even used to be called a "Challenger" until the marketeers got involved.
Can't believe either the 600s or 601s would be considered "common" with a CRJ to any great extent - the cockpit architecture is substantially different. The 604/605 are the most likely candidates for commonality (in fact, probably the only ones).
Only a partial answer, I fear.