 There are a number of issues about coincidence involving people. For example, it seems that we human people at least coincide with human organisms. You occupy the same location as a human organism right now, but it seems that you differ in various ways: the organism may have existed since conception, and will go on until biological death, but some believe that the person does not come into existence until the organism is relatively well-developed, and that the person may cease to exist before biological death, by entering a persistent vegetative state. You also seem to differ from the organism regarding what’s possible: perhaps you could have been a robot, or a disembodied intelligence, whereas the organism could not.