Titles and descriptions can get blurred very easily. And even more so as people and companies scramble for jobs and business.
"Engineer" once pretty much meant something physical was involved. "Systems" meant more of a design/planning view of things.
And I am more than willing to concede that there can be a widespread discussion of associated meanings and definitions. Not going to resolve that herein.
To your question: only you can decide. Start by looking at employment ads. See what titles are being used, read the job descriptions, learn the terminologies, acronyms, phrasing, job/position descriptions, etc..
Google what you find and wonder about.
For the most part many job descriptions are very broad and list any number of...