Bigger aircraft (any commercial flights aircraft basically) have a different training and type rating from each other.
This means even flying a 777 is different from flying a 737 (and even between 737 versions there are some differences to merit a retraining of crew)
So, no, even if you fly the 767 or the A330 you can't fly the 777 without going on training again (they're all aircraft though, so most of the principles apply)
Bigger aircraft (any commercial flights aircraft basically) have a different training and type rating from each other.
This means even flying a 777 is different from flying a 737 (and even between 737 versions there are some differences to merit a retraining of crew)
So, no, even if you fly the 767 or the A330 you can't fly the 777 without going on training again (they're all aircraft though, so most of the principles apply)