I've had a few discussions with people about the idea of "degrees of attainment" of a Sammasambuddha, Paccekabuddha, and a Savakabuddha. I personally think they're equal in their realization of Nibbana, but are only perceived as unequal by us. I think that the reason the Savakabuddha is considered unequal in attainment to a Sammasambuddha because a Sammasambuddha had taught them how to get this attainment, and a Paccekabuddha is perceived as unequal in attainment because they cannot instruct people, but I think this has less to do with the Paccekabuddha's ability to instruct, but the state of the minds around him. If the Buddha hadn't been prompted by Brahma Sampati he too would not have taught. This means he would have been a Paccekabuddha. The difference is that Brahma Sampati told him there's people around him who would be able to see and understand the Dhamma, so he could lead these people of lesser defilements to the same realization of Nibbana he attained. This is what makes the differences between the 3. It's got less to do with literal deficiencies, but more to do with how we perceive them as deficient.
I don't know if there's scriptural support for this view, but I don't see how there could be degrees of realization of Nibbana, but just degrees of our perception.
"One is not born a woman, but becomes one."- Simone de Beauvoir