I'm sure the Canadian folks who know much more than I can state better facts, but my guess is these Canadian versions were equipped with Packard Merlin 28 power plants and
Hamilton Standard propellers. From the photos below it certainly looks that the Ham Stand props were a bit too large for the typical Hawker Hurricane Spinner.
Below is a paragraph from a nice article from Vintage Wings of Canada.
http://www.vintagewings.ca/VintageNews/ ... Coast.aspx"For most young testosterone-fueled, newly-winged pilots of the Second World War, being a fighter pilot was the plum assignment, the glory job, the best of the best - a fighting man with the fastest and the most exciting aircraft of the day. Being chosen to become a Hawker Hurricane pilot of the Royal Canadian Air Force would surely induce the highest excitement levels and the studliest demeanour in a young flyboy. It was a golden opportunity for which there was no downside... unless, of course, you were selected to be a fighter pilot in a Canadian home defence squadron, stationed thousands of miles from the nearest real action. Even the ferry pilots got closer to the action than some of Canada's home defenders. But be as it may, those who found themselves defending the empty skies of Western Canada, did so with panache and professionalism."