For Unitarians! Is the being at Genesis 16:10 who multiplied Hagar's descendants the same being who multiplied Abram's descendanst at Genesis 17:1-2?

Genesis 16:10, "Moreover, the angel of the Lord said to her, "I will greatly multiply your descendants so that they shall be too many to count." Vs11, "The angel of the Lord said to her further, Behold, you are with child, and you shall bear a son; and you shall call him Ishmael, because the Lord has given heed to your affliction." At vs13, "Then she called the name of the Lord who spoke to her, "Thou are a God who sees", for she said, "Have I even remained alive here after seeing Him?" Genesis 17:1-2, "Now when Abram was ninety-nine years old, the Lord appeared to Abram and send to him, I am God Almighty; Walk before Me, and be blameless. Vs2, And I will establish MY covenant between Me and you, And I will multiply you exceedingly." Vs3, "And Abraham fell on his face, and God talked with him, saying," Verses 4-7 God reiterates His everlasting covenant with Abram, who is now called "Abraham." So again, here's my question? Is the angel of the Lord who multiplied Hagar's descendants the same being who appeared as God Almighty at Genesis 17:1-2 who multiplied Abraham's descendants? Please provide Biblical evidence for you position.