A lot of schools didn’t offer Software Engineering degrees until the past 10 years though, so people got CS degrees. In college, if I planned on doubling up on as many credits as possible for highest overlap (electives for one and required for the other), there was only a 12 hour difference in courses, which is just one more semester. I don’t think you could double major in them though because of how similar the fields were.

I started in CS for 2 years before swapping to SE, and it’s true that CS was a lot more theory, but we still had to do most of the time same hands on programming.