In my experience at UVic (6 months fresh) the CS students did more theory of computation, and SEng had formal requirements and specification writing, engineering economics, and project management courses that CS did not. And also yes, the capstone. So, those are the features which distinguish software big-E iron-ring engineering from computer science, in my mind.

e: and yes, cf. the sibling comment, some of those courses were mandatory curricula set by The Professional Body Formerly Known As APEGBC (I forget what they're called now).