Yeah, I agree. The voice might be the same but the tone is different!A lot of voice actors do multiple characters. Its not weird. He won't be using the exact same voice for both of them
He will have the same voice.Nope , Masked man and Madara will have the same voice . Madara meets obito unmasked , so obito willl have a different voice .
Great point..... Obito may have another voice when we see him unmasked.its really simple to explain... tobi always said he was madara, so he needed to imitate his voice as well, maybe when we se unmasked tobi his voice will change too because he wont need to imitate madara anymore