Great question Wiggums!
Having worked for a commuter airline I can say that flying the right seat of an RJ is somewhat different than flying the right seat of a 601. Here's why.
Flying an RJ involves flying to the same airports month after month, mostly domestic. Under normal ops, the SIC is responsible for SIC duties only. So for that duty assignment, he/she only has to focus on whether they are the PF or PNF for each given leg. When you have an SIC with around 1000TT, the skills of flying a large jet in the system are still being refined. I believe that most CRJ Captains expect low time SIC's to have a big learning curve once they get on line. (Of course there may be a 1000 hr Chuck Yeager out there that can fly circles around all of us. )
It has been my experience that when hired into a corporate flown large cabin jet, there is much more expected out of an SIC. From day one, it is expected that you know how to fly. For most corporate pilots, flying from point A to B is the simple part....it is knowing what comes before A and after B to make a trip successful....and to keep your job. Don't get me wrong, i'm not saying a corporate pilot is God's gift to aviation.....it's just quite different from airline flying. Within a few hours notice, we could be called to fly anywhere in the world....doing an approach to minimuns, to an airport we have never been before, in a foriegn country. Keep in mind that before this flight we had to arrange transportation for the passengers, arrange crew lodging, notify customs, arrange and sometimes prepare catering, check weather and determine the routing, arrange fuel stops...just to name a few tasks. While enroute, the crew is constantly making sure the client is comfortable....is catering satisfactory and should we order more food so it is ready at the fuel stop, look at what they would like to eat on the return trip, what is the flying schedule when we return, how is that going to affect the maintenance schedule, oh....the passenger just spilled red wine over the beige carpet....we need to get that cleaned upon landing...where?...we are at a foreign airport....Not AGAIN!! Not once did I mention anything about flying the airplane because both pilots have the experience to fly from A to B without the need to discuss how to do it. Yeah, we all may need a little refresher every now and then, but I have a feeling that a 1400 hr pilot would be more prone to "deer in the headlights" than someone a little more seasoned.
That's my 1/2 cent....of course I may be way off here, so be it!