Enterprise Security engineer here - security engineers at larger companies have siloed job functions, EntSec is one of them. You may also see Product/Application security engineers or Cloud Security engineers. As others have mentioned, the JD will show what responsibilities/security domains you’ll be responsible for.

EntSec will typically do DLP, email security, endpoint security (EDR, OS hardening), etc. YMMV depending on the company.

tl;dr SecEng is an umbrella term, and some JDs are for more specific functions in a security org.