If I copy a text document from one computer to another, is that the same document or a different one? It's all just information. If you copy it, you have two, it's still the same until the documents start changing and go different directions.
> Computer AI models don't run on a single machine
It doesn't matter on how many machines it runs on. It's information processing, as long as it gives the same results, it doesn't matter how you accomplish it.
Consciousness isn't some magic thing that sits on top, it's the result of that information processing. You take random sensory data, the brain transforms that into "cats, dogs, you, me", it uses uses those percepts to execute actions, gets more data back and checks how the actions changed the world state.
Keeping track of what changes in the world were causes by actions of the brain vs things that happened due to other causes is the conscious experience.