YHVH Elohim or Lord God, doesn't appear until Gen: 2:4 ...." These are the generations of the heaven and of the earth when they were created, in the day that the LORD God made earth and heaven." In this case there is a definite difference. One (Elohim), is now Two (Elohim, YHVH). The term made is used as opposed to created. It could be we are looking at another level, Keter and then Chokmah, or Atziluth and then Briah. It is food for thought.
Further YHVH Elohim continues as the principle actor until Gen 3:3 when Eve tells the serpent that Elohim says not to eat of the tree in the center of the garden. Once they eat of this tree, then YHVH Elohim returns walking in the garden. There is lots to think on here. I leave this for your perusal.
In Genesis 4:1 "And the man knew Eve his wife; and she conceived and bore Cain, and said: 'I have gotten a man with the help of the LORD" This is the first time YHVH is used alone. Another level has been reached. Much here to think on as well. My take on YHVH is that it is the I AM that Moses speaks to. Now we are in the world of Yetzirah.