There are a lot of verses where YHWH and the prophesied Messiah are not the same person. This isn't all of them.
Isaiah 42
1Behold my servant, whom I uphold; mine elect, in whom my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles.
2He shall not cry, nor lift up, nor cause his voice to be heard in the street.
3A bruised reed shall he not break, and the smoking flax shall he not quench: he shall bring forth judgment unto truth.
4He shall not fail nor be discouraged, till he have set judgment in the earth: and the isles shall wait for his law.
Psalm 45
6Thy throne, O God,
is for ever and ever: the sceptre of thy kingdom
is a right sceptre.
7Thou lovest righteousness, and hatest wickedness: therefore
God, thy God, hath anointed thee with the oil of gladness above thy fellows.
Isaiah 9
6For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counseller, The mighty God, The everlasting Father, The Prince of Peace.
7Of the increase of
his government and peace
there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever.
The zeal of the LORD of hosts will perform this.
Daniel 7
13I saw in the night visions, and, behold,
one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him.
Micah 5
2But thou, Bethlehem Ephratah,
though thou be little among the thousands of Judah,
yet out of thee shall he come forth unto me
that is to be ruler in Israel; whose goings forth
have been from of old, from everlasting.
4And
he shall stand and feed in the strength of the LORD, in the majesty of the name of the LORD his God; and they shall abide: for now shall he be great unto the ends of the earth.