Disclaimer: Not a web guy.
I am assuming by FE you mean web FE, this would really depend on the framework that an org is using. If other orgs are using React as their FE, IMO the major difference would be CSS. The language would remain the same JS/TS. Another difference would be how the web works in general, local storage, DOM manipulation, redirection to pages instead of screens etc. And also you gotta learn HTML. But the react/redux/JS knowledge would be transferable. Would recommend making webpages in react and host them somewhere to show your React skills.
Also make sure you know how to center a div 😉