Hi y not,
A Buddha (or a pacceka Buddha) realises the dhamma by himself, without any help from anyone else. Therefore a Buddha will not have attained any magga pala until he attains enlightenment.
If he did have some stage of magga pala before he was born as Siddhartha, then he would have been an ariya shrawaka and will not be a Budda / Bodhisatta.
Bodhisatta is actually a name / label given in retrospect. So a bodhisatta may not even know that he is one. He is just a person going in search of the truth and help everyone else see the truth.