You may be able to imagine a body physically identical to yourself not having a consciousness, but you cannot deduce from that, that this is something that can actually happen in our Universe. It may just as well be true that any exact physical copy of a body containing a consciousness is also conscious. In fact, the latter seems like a simpler assumption than the former.

My own take is that we, as biased humans, put too much value on consciousness. I have not seen any evidence that consciousness is nothing more than a convenient way to organize a complex pattern of elementary particles for self preservation. In that sense the discussion of consciousness is an interesting exercise in analogies, and while it may very well put us on a track to better understand everything from quantum mechanics to the mind, it still, to me, has a very anthropic vibe to it.