Some people evidently do not hear a voice in their head. It generally blows the minds of people who do, but minds are so varied its possible we’re misunderstanding each other when discussing voices in head. Similar to the question if two people see red, but only know it’s red because someone taught them, can we be absolutely sure we both experience the exact same “red”?
If your mental white balance is off, everything would vary in the same amount, but if you could b9th project the image you see somehow into another mind it would look different.