There is a huge amount of human variation, but one of the big ones is some people don’t have an internal monologue and some people lack the ability to visualize things in their mind.
Either one of those drastically changes what we think of as a consciousness.
Hell, some of the split brain subjects are probably still alive. Some of them had two distinct consciousnesses emerge due to their hemispheres no longer being able to communicate. That’s definitely unique now that we’re not cauterizing corpus callosums anymore.