I am Canadian and I feel that it is mostly the same. We do have a little more British influence so our spelling is sometimes different. There are a few uniquely Canadian words but 99% is the same. It mostly comes down to accents. Although most of the US and Canada would be very similar, people from Eastern Canada have a thick accent (that even other Canadians find funny). Similarly, the US has different regions with different accents (eg. Boston vs L.A. vs Texas).