It is entirely down to how determined they both are.
If they are identical, they will think the same and attack the same. Therefore, it's down to whether or not they will fight to their own inevitable death. If so, it's mutually assured destruction, if not it's a truce.
If they are identical, they will think the same and attack the same. Therefore, it's down to whether or not they will fight to their own inevitable death. If so, it's mutually assured destruction, if not it's a truce.