Actually, the A330 and A350 are a common type rating, you still need a difference training that takes about a week and some simulator flying.
Common typerating is something that boeing did for years, first with the 757/767 and more recently with the 777/787. Still doesn't mean you won't have to train before you fly the second flight.
And of course depending on experience one doesn't need to do real landings anymore, the first real landing after changing types is usually a normal revenue flight with passengers in the back.