Jehovahs Witnesses dont believe anything the same way other Christians do thats why they are Witnesses of Jehovah and not Witnesses of Jesus as the Christian Greek scriptures instructs Christians to do.
how will life in the Millennium be any different than life after the Millennium?
Simply stated instead of Jesus being King and ruler forever, after his thousand year rule , he hands it all back to Jehovah to be THE TRUE GOD and RULER over mankind as it was in Eden .