Depends on where you are. At least colloquially in many places, they're the same thing. In places that have engineering certification boards and enforce the use of the word "engineer", an "engineer" would usually be able to analyze the correctness of, and sign off on something safety-critical, taking on some level of legal liability for doing that. Kind of like the civil engineer signing off on a bridge, or an architect signing off on a building design.

The line's blurry, except for places where the law gives a sharper distinction.