It is possible to know. While we still don’t have the capability to do full brain emulation for hardly any species, we are left with comparison studies. These

It is possible to know. While we still don’t have the capability to do full brain emulation for hardly any species, we are left with comparison studies. These comparison studies should be as equally valid between humans as animals. We can only compare behavioral responses. You can perform similar behavioral studies among people that don’t speak the same language for example. I admit it’s not easy with humans, given how interconnected we are culturally but it’s not impossible.