The Buddha teaches us rebirth is not necessary to the attainment of enlightenment, and there is no fundamental difference between the enlightenment we are capable of achieving and the enlightenment achieved by the Buddha or by any Buddha of any realm. There is not an enlightenment of Sravakas, or an enlightenment of Pratyekabuddhas, or enlightenment unique to Bodhisattvas. There really is one enlightenment, and that is of Buddhahood, and it is something inherent in all life.