You seem to me to be fundamentally confused about the separation between the (at a minimum) two levels of reality being proposed. We have a simulation, and we have a real world. If you affect things in the simulation, such as replacing Venus with a planet twice the mass of Venus, then they are not the same; the gravitational field will be different and the simulation will follow a path different to the simulation with the original Venus. These two options are not “computationally the same”.
If, on the other hand, in the real world you replace your old, badly programmed Venus Simulation Chip 2000 with the new, shiny Venus Simulation Chip XD500, which does precisely the same thing as the old chip but in fewer steps so we in the real world have to sit around waiting for fewer processor cycles to end, then the simulation will follow the same path as it would have done before. Observers in the sim won’t know what Venus Chip we’re running, and they won’t know how many processor cycles it’s taking to simulate it. These two different situations are “computationally the same”.
If, in the simulation world, you replaced half of my brain with an apple, then I would be dead. If you replaced half of my brain with a computer that mimicked perfectly my old meat brain, I would be fine. If we’re in the computation world then we should point out that again, the gravitational field of my brain computer will likely be different from the gravitational field of my meat brain, and so I would label these as “not computationally the same” for clarity. If we are interested in my particular experiences of the world, given that I can’t detect gravitational fields very well, then I would label them as “computationally the same” if I am substrate independent, and “computationally different” if not.
I grew up in this universe, and my consciousness is embedded in a complex set of systems, my human brain, which is designed to make things make sense at any cost. I feel purple whenever I go outside—that’s just how I’ve always felt. Purple makes sense. This is fatal for your argument.
(Now, if one day soon my qualia jump from one state to another, now that would be something interesting.)
Ok, I’ll give a longer response a go.
You seem to me to be fundamentally confused about the separation between the (at a minimum) two levels of reality being proposed. We have a simulation, and we have a real world. If you affect things in the simulation, such as replacing Venus with a planet twice the mass of Venus, then they are not the same; the gravitational field will be different and the simulation will follow a path different to the simulation with the original Venus. These two options are not “computationally the same”.
If, on the other hand, in the real world you replace your old, badly programmed Venus Simulation Chip 2000 with the new, shiny Venus Simulation Chip XD500, which does precisely the same thing as the old chip but in fewer steps so we in the real world have to sit around waiting for fewer processor cycles to end, then the simulation will follow the same path as it would have done before. Observers in the sim won’t know what Venus Chip we’re running, and they won’t know how many processor cycles it’s taking to simulate it. These two different situations are “computationally the same”.
If, in the simulation world, you replaced half of my brain with an apple, then I would be dead. If you replaced half of my brain with a computer that mimicked perfectly my old meat brain, I would be fine. If we’re in the computation world then we should point out that again, the gravitational field of my brain computer will likely be different from the gravitational field of my meat brain, and so I would label these as “not computationally the same” for clarity. If we are interested in my particular experiences of the world, given that I can’t detect gravitational fields very well, then I would label them as “computationally the same” if I am substrate independent, and “computationally different” if not.
I grew up in this universe, and my consciousness is embedded in a complex set of systems, my human brain, which is designed to make things make sense at any cost. I feel purple whenever I go outside—that’s just how I’ve always felt. Purple makes sense. This is fatal for your argument.
(Now, if one day soon my qualia jump from one state to another, now that would be something interesting.)