downwind,
I've trained hundreds of pilots on 'steam driven instruments', who then went to 'glass'. For them it was a walk in the park.
Also, when the B747-300 was still rampant, I've trained hundreds of pilots on 'glass', who then went to 'steam driven instruments'. For them it was tough going.
Does that answer your question? (Methinks it was a self-answering question).
Regards,
Old Smokey