U.S. vs. Canadian English keyboard What is the difference between an US and a Canadian English keyboard layout? Could you give a visual comparison?
There's no difference except for the flag icon.  It is presumably there so that Canadians don't have to be looking at the US flag all the time to type their language.  The same holds for ABC, which is the same as US but no flag at all, for the rest of the world.

Unfortunately Apple does not document anywhere the dozens of different software keyboards/input sources which it provides.