With the types of difference between the two universes, it would be nearly impossible to keep events in synch down to the personal lives of the main characters, yet this is exactly what is seen where people have relatively the same jobs, live in the same place, and have the same family members. Yet in the broader universe there are such major changes as President Kennedy never being assassinated (presumably meaning no President Johnson and a radically different Vietnam War), the 9/11 attacks partially averted, as well as major cities destroyed by anomalies and thousands dead who were still living in the other universe. Not to mention whatever different events happened in centuries past; with all this, the two universes would have diverged so much that there would be literally no chance of exact copies of people existing on both sides.