Software Engineering is a course when taking Computer Science. To further elaborate, software engineering is like a branch of Computer Science. In a venn diagram, Software Engineering is inside the Computer Science circle.

SE involves the process like agile, waterfall, scrum to create applications or system.

As the top answer in the link mentioned, Computer Science is the theory. And Software Engineering is the application of that theory / the practice. With it, Computer Science includes automata, discrete mathematics, neural networks, compiler theory, machine learning, and such.