Ghengis
I hate to differ with someone of your qualifications and experience (which is many fold more than mine) and I do agree that the odd hour or two will take a low hour PPL from the 38 to the 151, 161 and 181, but to me, a -236 is a different proposition.
Its heavier and demands careful landing (i.e. flare 'pull' required is rather more than the Warriors & Archers), it is much faster in the cruise, CSP/manifold pressure to get used to and its injected (i.e. hot starts are challenging.)
By no means a 'hot ship', but needs a bit more than the odd hour of differences training IMHO.