It’s got nothing to do with the sidestick, it the aircraft’s systems as a whole. You can’t just jump from a 737 to the 787 either. The only two Boeing families

It’s got nothing to do with the sidestick, it the aircraft’s systems as a whole. You can’t just jump from a 737 to the 787 either. The only two Boeing families that share a type rating are the 757 and the 767.