You mean, US and Canadian accents sound different?
After three years of living in the States, I was *almost* able to tell Mid-West and North-East apart. I only know to listen out for the “aboot” vowel because of South Park. (And imagine my surprise when I heard the same vowel shift in Southern Virginia.)
Americans have a devil of a time telling Australian and New Zealand accents apart. Same on the flip side. It’s all about familiarity.
Or aboot even.