In terms of students who are applying to go into residency training, there is no real difference between Canadians who grew up in Canada and went abroad to do their undergraduate training and people who have come to Canada and wish to go into a residency position. All of the applicants must be permanent residents of Canada to apply.
So it depends. In fact, that is not the case: they are the same in terms of their positioning in the residency competition. A large number of Canadians are studying abroad.