It is the same browser. LibreWolf doesn’t change much of the Firefox code, mostly just the configuration. They enable various privacy/security settings by default and remove Mozilla telemetry. You can go to the LibreWolf settings and enable Firefox Sync, and it will work just fine with your Mozilla account and other Firefox browsers.
For Android, I like to use Mull, it’s a hardened build of Firefox, similar to LibreWolf.