Hi there, good question. i've worked with a few people that have come from a training program in the united states. a few have been emt's (pcp's up here) and one has been a paramedic (acp up here) while both have had no trouble coming here. They have had to prove what their training took, and if there was any differences in the training, and our scope of practices, they would take a quick con-ed type course on it. The only thing the paramedic from the states had to do, was learn about the blood glucose readings and everything up here.
As for which province you go to, their local protocols will vary, and some provinces (ie: saskatchewan) won't let you do very much. Whereas provinces like alberta, bc, and ontario will let you do alot. Depends on what level your trained to, you may even qualify for the critical care paramedic level. I hope this helps you. If you have any other questions, you could always PM me.