Kingdom Hearts Is Roxas Actually Sora

It could be a yes and no answer at the same time because Roxas is Sora's nobody. But I say no because he is known as Roxas not as Sora. If he was the actual Sora, he would be called Sora, and basically have the same friends, life, and past. But, he is Sora's nobody so he is sort of like related to him in a way.