Up to '17 inclusive the Z force E brake is an entirely separate disk brake located on the rear driveline, while the '18 and later the E brake handle just engages the regular service brakes on the back.
The 19 have the half doors whereas I had to buy mine for my 17.
The Canadian models have turn signals and horn but no roof, and they have the huge warranty but at the amount they cost you could say that they have a 5 year extended warranty as standard equipment, no opting out.