Same person experiments
Is the end goal an animate body with the same looks, behavior, and personality as before or is it the restoration of the same ixperiencitness. There is a very big difference because you can have one without the other. the most reasonable solution is the restoration and or continuation of looks, personality and ixperiencitness.
There is no way to deal with supernatural concepts like souls. For instance like replacing them in a body that has been dead for long periods of time. We cannot see or detect souls, thus we cannot tell them apart, see if they are connected to a body or connected to the right one. Everything about supernatural concepts is speculation and imagination. Nonetheless, many people believe in supernatural concepts. If we insist on trying to be scientific using supernatural concept in the end we still know nothing about reality except it can create may supernatural concepts by way of our conscious imagination.