I want two iPhones with different phone numbers but the same Apple ID.
Is there any problem copying the first via iCloud and Mac to the second and using both?
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Yes, surely you can do that.
In general, there's nothing hindering you from having multiple phones logged into the same Apple-ID - but with different SIM-cards and phone numbers. I.e. you do not need to copy an existing phone in order to achieve this - you can also just setup a new phone as a "blank" device and login to your Apple-ID.