no, there is even difference among the azores islands, and huge ones inside Brazil, example, in some parts of the south of Brazil they speak a kind of old Portuguese, people from azores are responsable for that. Santa catarina state is a good example, but both, Azores and santa catarina, they received portuguese emgirants from others parts of Portugal, as minho. Azores has some influence from french, normands, and even from flemish, some azorean surnames are not portuguese ones. But that depends of the islands, and the same influence appears in some parts of Portugal as aveiro, for instance. Normands and flemish they went as cruzades, they help also in the "discoveries". Another main help was from genoveses. They also was inclunded in the first colonization of Brazil. Well, as you can notice is hard, ehehe, historical thing. but in short we can find some similarities, in some parts of brazil, but in general not. Brazilian Portuguese the common is fom rio and sao paulo.