Both groups have much variation from the traditional beliefs. Also I just recently heard of the Jesusonian denomination.
What are the main differences between these two denominations?
Based on a Wikipedia article, I understand that Jesusonians are associated with Urantia. One major difference between them and Protestantism include a belief in soul sleep and annihilationism, similar to Seventh-Day Adventism. Other differences include:
Jesus' crucifixion is not considered an atonement for the sins of humanity. The crucifixion is taught to be an outcome of the fears of religious leaders of the day, who regarded his teachings as a threat to their positions of authority.
Jesus is considered the human incarnation of "Michael of Nebadon," one of more than 700,000 "Paradise Sons" of God, or "Creator Sons." Jesus is not considered the second person of the Trinity as he is in Christianity. The book refers to the Eternal Son as the second person of the Trinity.
Jesus was born on Earth through natural means of conception instead of a virgin birth.
Jesus did not walk on water or perform some of the miracles that are attributed to him in the Bible.
Here is a link to another article that may be relevant: https://urantia-association.org/2018/jesusonian-calling-go-third-mile/