One of the more amusing ways of thinking about the identity of all electrons is the idea that there's actually only one electron. This single electron moves backwards and forwards in time. When going backwards in time, it is an anti-electron (positron), and when forwards, it is an electron. In this way we get the illusion that there is more than one electron, but there is actually just the one. That's why they all have the same properties, in this not-completely-serious view.