Not unusual, for imports especially, to have different warranty programs for different countries. Warranties and pre-paid service are marketing tools, cost built into the sale price, dealers in each country have to be paid from the distributor/importer having the fund reserve for that particular program. Paying across borders requires fund transfers that raise tax issues a corporation will usually try to avoid.
Check warranty terms for any vehicle, before taking it from U.S. to Canada or Mexico. Very few warranties are global, and for many smaller high value products that do have an "international" warranty, the U.S. warranty is still separate.