Well do be a Frenzied Berseker you have to be able to Rage anyways to get into that PrC.
But with regards to the Alternate Class selection, you either pick up the ability to Rage or get Berserker Strength. They do not equal each other with regards to feat selection. If they did, there would be a side note, such as the one with Ninjas and how Sudden Strike = Sneak Attack.
So to answer your question: No.