Let me repeat just for clarity: You mustn’t use the same ID on two devices.
And then: What do you actually want to achieve? I.e. what’s your use-case?
As to breaking connections: I didn’t think through exactly what would happen, that also depends on the exact setup in which you have duplicate IDs. I didn’t do it because it’s needlessly lost time to think about it in detail: It’s against the core principle of what the ID is, and that premise is used throughout the code - don’t do it.