Mormons and JWs are similar in they believe Jesus is an angel and "a god".
Mormons believe that Jesus is Jehovah. In the Book of Mormon, Jesus visits his "other sheep" in the Western Hemisphere:
And again the third time they did hear the voice, and did open their ears to hear it; and their eyes were towards the sound thereof; and they did look steadfastly towards heaven, from whence the sound came. And behold, the third time they did understand the voice which they heard; and it said unto them: Behold my Beloved Son, in whom I am well pleased, in whom I have glorified my name--hear ye him. And it came to pass, as they understood they cast their eyes up again towards heaven; and behold, they saw a Man descending out of heaven; and he was clothed in a white robe; and he came down and stood in the midst of them; and the eyes of the whole multitude were turned upon him, and they durst not open their mouths, even one to another, and wist not what it meant, for they thought it was an angel that had appeared unto them. And it came to pass that he stretched forth his hand and spake unto the people, saying: Behold, I am Jesus Christ, whom the prophets testified shall come into the world. And behold, I am the light and the life of the world; and I have drunk out of that bitter cup which the Father hath given me, and have glorified the Father in taking upon me the sins of the world, in the which I have suffered the will of the Father in all things from the beginning. And it came to pass that when Jesus had spoken these words the whole multitude fell to the earth; for they remembered that it had been prophesied among them that Christ should show himself unto them after his ascension into heaven. And it came to pass that the Lord spake unto them saying: Arise and come forth unto me, that ye may thrust your hands into my side, and also that ye may feel the prints of the nails in my hands and in my feet, that ye may know that I am the God of Israel, and the God of the whole Earth, and have been slain for the sins of the world.
Jehovah's Witnesses, conversely, believe that Jesus is Michael, the Archangel.
The Latter-day Saints ("Mormons") believe that when Adam and Eve transgressed, that Man needed a Mediator then, and that Mediator was Jehovah, who was later born into the world as Jesus. The New Testament writers understood this, but they intentionally withheld it, except for John. Instead, they differentiated between "God" and "Jesus." Why? Because they were sensitive to their audience, many of whom were converted Jews. Stephen saw Jesus on the right hand of "God" in his vision, for example, and these references have confused the Jehovah's Witnesses and others. But John clearly knew and identified Jesus as Jehovah in his Apocalypse. All through the Old Testament, Jehovah was to come and judge the nations; but John said "the Father judgeth no man, but has committed all judgment to the Son." (John 5:22) Both Jesus and Jehovah were the First and the Last, the Alpha and Omega. The Father, however, only communicated with Man to bear witness of the Son, nothing more. It was Jesus who spoke to Moses, and to Abraham, Issac and Jacob.
Again, in the Book of Mormon, a prophet hundreds of years before the birth of Christ recorded:
And [Jehovah] saw that the brother of Jared had fallen to the earth; and the Lord said unto him: Arise, why hast thou fallen? And he saith unto [Jehovah]: I saw the finger of the Lord, and I feared lest he should smite me; for I knew not that the Lord had flesh and blood. And the Lord said unto him: Because of thy faith thou hast seen that I shall take upon me flesh and blood; and never has man come before me with such exceeding faith as thou hast; for were it not so ye could not have seen my finger. Sawest thou more than this? And he answered: Nay; Lord, show thyself unto me. And the Lord said unto him: Believest thou the words which I shall speak? And he answered: Yea, Lord, I know that thou speakest the truth, for thou art a God of truth, and canst not lie. And when he had said these words, behold, the Lord showed himself unto him, and said: Because thou knowest these things ye are redeemed from the fall; therefore ye are brought back into my presence; therefore I show myself unto you. (Ether 3)
So again, Jesus is Jehovah in LDS scripture.
I don't think people will be damned for what they believe. God judges a man by the man's sincerety, which only God knows, for only God knows what is in a man's heart. So thus it is with the Jehovah's Witnesses and with all men. The only ones under condemnation are those who, knowing the truth, reject it. In short, a man cannot be saved or damned in ignorance. The Lord, being Just, judges men by what is in their hearts.