Un-learning for better word.
Having done a few 1000 hrs of type rating courses and some line training I would say one of the biggest problem SOME experienced pilots have is forgetting about the " Other" aircraft , when they get stressed.
Had an experienced ATR captain try to use the steering tiller on a xwind T/o during linetraining on a Do328 TP out of Fornebu Oslo.
Fortunately it did not work, would have been catastrophic.
Also had some good fun in the 737 sim watching experienced Airbus, Fokker, MD80 and Dornier pilots try to find the TOGA button on a go around.
Also going direct Long Haul captain from a different SH manufacturer is not a good idea, I think!