In the Old Testament God's visible appearance is called 'Jehovah' who spoke through the mouth and through the life of prophets to His people. In the New Testament He reveals Himself through the Lord Jesus Christ. In this sense, they are the same. After putting off His divinity, Jesus Christ became man, Son of Adam (Son of man) with the legal right to the throne of David. In His resurrection He received the glory of an anointed as well as the appointment of Son and High Priest.
In our day, God entrusts us believers to Him. We have received His life. As the risen High Priest, He keeps us clean now. So we should - just like He did - lay aside our old nature. We became citizens of Heaven knowing that in the future His hidden Kingdom will become visible on earth.