From my perspective, React Navigation primarily differs from React Router in a few ways:

1) In RR, nav state is the URI. Because mobile nav state is complex, React Navigation treats URIs as actions to modify a more complex navigation state

2) RR uses React Components for navigation logic. In React Navigation, the isolated nav logic is statically available, (without rendering).

3) React Navigation is composable, so navigators can be configured to delegate navigation logic to child routers.