If it's an LX, it has an F22B2(130hp). If it's an EX, it has an F22B1(145hp). I know the EX is a VTEC motor, not sure about the LX, though I don't think it is. Easiest way to tell is to look for a VTEC solenoid and pressure switch. As for a B16 in an Accord Wagon: 1.It doesn't bolt in, 2.No one makes a kit because noone would want to do that swap, and 3. you're talking about putting a hi-revving, torqueless motor into a 4000 lb. car. Maybe I got it all wrong and you were talking about putting the Accord's motor in the Rex, but that's not a good idea either. Too much expense, too much weight, too much understeer, not enough power. Word of advice, stick with the CRX for a swap.
ALSO, pissedoffsol said it best: Vtech is a phone, VTEC is an engine. I'm not trying to be an ass, I just don't want to see you get flamed off the board
Hope that helps.