The show never really said but it is doubtful that they are.
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Vegeta!!!
Depend on which version of Goku you're speaking of: Goku SSJ1 vs Majin Vegeta: Majin Vegeta Goku SSJ2 vs Majin Vegeta: Equal Goku SSJ3 vs Majin Vegeta: Goku Goku SSJ4 vs Majin Vegeta: Goku
because vegeta is the prince of all saiyans and goku is a lower class rank and goku is always one step in front of vegeta.
Right. It's because Vegeta visted Goku and Vegeta forgot that he had ammnesia and later Goku said he was a good guy.
vegeta joins goku when it came down to it to defeat freiza