As far as your 200 type and it's ability to translate to the 300 ... no problem. I did my type in 1980 something in the 200 basic ... that airplane was three years younger than me !
The major differences are obvious ... the CFMs on the 300/500/700. The 300/500's have two different pressurizations system controllers. The end result is the same, but the operation in manual mode and normal setup is different. Should take you 20 mins to figure this one out ...
The A/Ps are completely different on the 200. Can you fly cross cockpit ? If not ... and you fly one of our 200s ... you will learn how to while in the FOs chair. Again ... maybe a few legs until you are comfortable. One 'gotcha' on the 200 is it WILL NOT CAPTURE AN ALTITUDE ON A/P. This one will wake you up in a flash if you forget !
Tell the captain you are a newbie and they will nurse-maid you if necessary.
Each of our series have a different 'hands on' feel. If you came from heavy transports, the 700 will be familiar. If you flew TPs or tactical aircraft, the 200 will have the same feather touch ... Personally I like this one the best. The 300/500 have a feel all their own ... a little nose heavy for my liking.
And one think is true of all of them ... it's very difficult to go down and slow down. It's nearly impossible to do it in a 200 if you are in moderate freezing precip due to the engine limitations.
Next Question ...
As far as I know ... OAK is junior and has been for 6 months. There are FOs in PHX, OAK, MDW trying to get to BWI so it might be a while if you want to come east.
BWI will be getting some more long - hauls soon ... Personally I'm hoping for BWI-SEA / BWI - SAN / BWI - OAK ...
SL