Without getting bogged down in rigid definitions of phrases, do we both agree that this is about the application of deeper technical concepts and algorithms (usually taught as part of a computer science curriculum) towards real world problems than the normal “build this login form” or “write these 5 queries to generate this report that shows up in an html table” that 75% of devs do daily?
CS is the study of computations and their theory (programming languages, algorithms, cryptography, machine learning, etc).
SE is the application of engineering principles to building scalable and reliable software.