If the two cranes travel on the same rail tracks/ runway, of course they cannot pass each other.
What I like to simulate, is a crane system where two cranes, with different heights, travelling on two different runways work as one system on one storage block.
Inter-crane interference happens between the cranes, when the larger crane lowers its lift/crane while the smaller crane tries to cross. Also, if the larger crane transports a (e.g.) container and crosses the smaller crane, it needs to move its cab to the leftmost lane (service lane) first, because it cannot lift a container above the small crane’s cab. When cranes interfere, a safety distance has to be respected.