My brother got involved with JW’s many years ago. He finally got out of it before he passed away.
All cults teach “another Jesus”, just what Paul warned us against. In the case of JWs and SDA, Jesus is taught to be the Archangel Michael.
Adventists and JW’s have differing understanding of whom Michael is. Adventists believe Michael is the pre-incarnate form of Christ, but He is still God. JW’s believe that Christ is a created being and, therefore not God.