At least in French speaking Canada, the curriculum for software engineers is not really anymore rigorous than the curriculum for CS (of course, depending on your university). Even in math, some math classes are less rigorous or watered down for engineering, while some are taken by engineers but not necessary for CS students.
My understanding was the curriculum had more classes (a year longer) and less flexibility for course selection (you can't major in CS and get a minor in history for instance). Your electives are going to be engineering classes.
In the French Canadian system you generally don't do major/minor, you study only one field. It's relatively rare to do it another way. Electives are the same that way but you have 5-6 engineering-only societal classes (economics, ethics, etc...)
