Many prominent Sunni scholars e.g. Al Qondoozi Al-Hanafi admit that the twelve successors of the Prophet Muhammad (SAWA) are the twelve Imams from Ahlul Bayt (AS) from Imam Ali (AS), then his son Imam Hasan (AS) , then Imam Husain (AS) till Imam Al-Mahdi (AS).
But many other Sunni scholars wrote about the twelve successors in different ways. Ibn Taymiyyah after admitting that the twelve successors of the Prophet Muhammad are mentioned in Torah and Bible, claimed that Yazeed, son of Mo'awiyah is one of the twelve successors.
Ibn Arabi Al- Makki who is a well known Sunni Sufi scholar claimed that Al-Mutawakkil Al-Abbasi is one of them.
You find in Sunni books different claims about the twelve successors upto the extend that Ibn Al-Jawzi who was a prominent Sunni scholar said when he mentioned the Hadeeth of twelve successors: I can not understand the meaning of it.
This mess among the Sunni scholars adds that the real twelve successors after of the Prophet are none but the 12 Imams from Ahlul Bayt (AS) about whom the Prophet himself mentioned with their names in many authentic Hadeeths including Hadeeth from Jaabir bn Abdillah Al-Ansaari who was told the names of the twelve successors by he Prophet himself.