Hey @Tosteeer great question.
If I understand your question correctly what you are trying to achieve is move an existing public cloud dns zone from one project to another. In this case, when you create such zone under the second project (given the domain is exactly the same) it will be created on a different set of name servers.
See here it reads
A new managed zone of a domain, for example **domain.example.tld**,
cannot be assigned to a shard if any of the following already
exists on the same shard:
- A managed zone with the same DNS name, such as **domain.example.tld**
<...>
Hope it helps with your planning.
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