Trinity and Oneness is really the same.
Both believe in Father, Son, and Holy Ghost, both believe in the deity of Christ, both are Pentecostal, the difference coming down to one word - “person.”
Oneness Pentecostals point out nowhere does the Bible call Father, Son, Holy Ghost three “persons.” They do not believe in three divine people, they believe such notions come from Gentile philosophy, not Jewish monotheism...which is how all the writers of the Bible believed about God.
Remove the word “person” and you are are right, there is no difference between Oneness and Trinitarian Pentecostals...in their theology about God.