I've never actually heard the three regional names in the title used for parts of Canada, or heard Canadian regions lumped into their American variants.
That said, some American-origin regional names do have cross-border evocations.
The classic example is SW BC lumped in with the Pacific Northwest. This doesn't make sense in the Canadian context.
The Prairies are sometimes lumped in with the Great Plains, and obviously the Rocky Mountain region has cross-border ramifications as well.
Southern Ontario is often lumped in with the Great Lakes states, and the Maritimes are often portrayed as a kind of Extended New England.
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