Hi, so basically System engineers design computer systems that bring together software, hardware, and employees. These engineers monitor the work productivity and any problem reports from new systems in order to make further modifications whereas a DevOps Engineer is a person who understands the entire SDLC and has an understanding of various automation testing tools for developing pipelines, i.e., CI/CD pipelines. In addition, DevOps essentially means building digital pipelines that take the code from the developer’s laptop all the way to the operations guy’s laptop, and it results in a revenue-generating product!
you can read a more detailed answer here
hope this helps cheers