So they look incredibly similar to another missing person and are mistakingly identified as the other person and the hospital later finds out they’ve made a mistake after they’re back with the other person’s loved ones / family and they don’t notice the difference
What would happen and has this happened before
If the “right” person was under hospital care, and the “wrong” person is found and return in their place I imagine the indicators in their hospital care would be pretty clear they have the wrong person.