When I went through my 737 type rating, my partner was an A-10 guy. Initially had a few problems with CRM and with letting the PNF help him out, but after a couple of sims, he was able to adapt quite quickly although I had to interject occasionally to let me help him. I would say, he had a harder time adapting to actually flying the 737. He didn't understand why there were soo many flap settings and had a little problem adapting to the automation and lack of maneuverability.