Apply for two courses in same department of University

Hey there everryone!

I had one question about apply to uni. I was deciding that I wanted to apply for both Physics and Aeronautical Engineering at Uni of Glasgow. My friend pointed out that there really isn't a point of apply for both physics and aeronautical at same place in glasgow uni since the same department handle and hence the condition you might get willn't be different whereas if you apply for physics and aeronautical in two different universities you might get different conditions. Is this true ? and what really is the true option?