In practice, it is possible to use one EnOcean switch in two different networks if the networks use the same frequencies and the same network mode. The network frequencies can only be configured when creating a network for the first time and cannot be changed after a network has been taken into use. The switch can then be added to both networks, for example to control scenes.
However, this is not a recommended way to use an EnOcean switch, as it can result in some delays or potential erratic behaviour. Casambi do not guarantee the functionality if EnOcean switches are used in this way.