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All certified Z-Wave products conform to their communication protocol. And that's what ensures interoperability.
In particular, a certified product must register with a Z-Wave network controller. The latter gives out a 4 byte network / home ID to the former and also assigns to it a 1 byte node ID.
The node ID ensures that each product registered to a ...
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You would need a 'gateway' that can translate from CoAP to MQTT (and vice versa). Various examples exist, such as:
emq-coap which allows CoAP clients to communicate with an instance of the EMQ MQTT broker (a usage example is given in the README)
Eclipse Ponte, which bridges HTTP, MQTT and CoAP. An example is given that you can send a message to mqtt://<...
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