Well, my dear friend, I want to be careful how I answer this good question. Our Lord Jesus Christ is in fact part of the Godhead, God the Son. So, in a very real sense, the Lord Jesus is involved in all the activities of God, being Himself God. As you probably know, Jesus is the name of God the Son that was given to Joseph by the angel of the Lord at the time prior to the birth of Jesus (Matthew 1:21-23). The name “Jesus” means “Jehovah the Savior”, and the term “Emmanuel” means “God with us.” Our Lord Jesus is in fact God the Son, and is part of the Trinity, co-equal with God the Father and God the Holy Spirit. In John 1:1-3 (JND), we read: “In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things received being through him, and without him not one thing received being which has received being.” Going on in John 1:10 (JND) we read: “He was in the world, and the world had its being through him….” Then in John 1:14 we read: “And the Word became flesh, and dwelt among us (and we have contemplated His glory, a glory as of an only-begotten with a father), full of grace and truth….” Thus, we see that the Lord Jesus is true God as well as true Man, and He was with the Father from before the foundation of the world, and it was by His very voice that creation came into being (see also Colossians 1, Hebrews 1, and Ephesians 1). However, while in the NT we know Him as the Lord Jesus, in the OT, we do not see the specific name “Jesus,” but rather we see one of several names by which God makes Himself known, of which Christ Jesus is one of the three persons of the Godhead.

But now, let’s consider the names for God in the OT verses relating to your question.  Using the JND translation of the Bible, we read in Exodus 3:2-4: “And the Angel of Jehovah appeared to him in a flame of fire out of the midst of a thorn-bush…And Jehovah saw that he turned aside to see, and God called to him out of the midst of the thorn-bush…!” In verses 2 and 4, we see the name “Jehovah,” which means “the self-existent One”, the great I Am.” The second use of “God” in verse 4 is “Elohim,” and in the Hebrew, this term is plural, but this word generally points to the God of creation, and we know that the Lord Jesus, as God the Son, acted in creating and in sustaining all things. According to the Morrish Bible Dictionary defining the word “God,” we read that the translation of God in Isaiah 9:6 is “El, ‘the strong or mighty one’,” and we know that this verse is a specific prophesy of the coming of the Lord Jesus Christ.  That verse says, “For 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.”

Finally, we do find NT verses that specifically identify the actions of Christ in certain OT portions of Scripture, such as 1 Corinthians 10:4, where we read: “…and did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.“  According to the MacDonald Bible Commentary, this verse is explained as follows: ”All through their journeyings, God wonderfully provided water for them to drink. It was real water, but again it is called spiritual drink in the sense that it was typical of spiritual refreshment, and miraculously provided. They would have died from thirst many times had not the Lord given them this water in a miraculous way. The expression they drank of that spiritual Rock that followed them does not mean that a literal, material rock journeyed behind them as they traveled. The Rock signifies the river that flowed from it and followed the Israelites. That Rock was Christ in the sense that He was the One who provided it and the One it represents, providing living water to His people.”

So, in summary, I believe that there is divine purpose in the names for God that the Holy Spirit inspired godly men to use when the Scriptures were given to us. I would therefore generally not be comfortable in identifying one of the persons of the Godhead over the others in OT verses, but rather would go with the names for God that the Holy Spirit has given us, even though we know that Christ is one of the persons of the Godhead.  (SF)  (599.2)