I'm going off of memory here because i don't have a roboRio to test with, but I'm fairly certain that within the Rio's web interface you can change the names of cameras to satisfy having the name cam0 or cam1.
Another way around this is with the
cameraServer class, wich allows you to specify what camera you want to get the feed one.
For the example below, you would be receiving data from cam3 on the rio dashboard.
Code:
void CameraServer::StartAutomaticCapture (cam3)
If the above code doesn't make much sense i apologize, but I'm a java programmer.