Egyptian pharaohs primarily differed from kings of other cultures in that:
They were considered gods.
While many cultures had kings with significant power and authority (absolute rulers), the unique aspect of Egyptian pharaohs was their divine status, which distinguished them in their role as both political leaders and religious figures, believed to be intermediaries between the gods and the people. Additionally, they were often seen as immortal, but this concept of divinity is the key difference that sets them apart from kings in other cultures.