Shouldn't be a problem, Leon. I have several iDevices - whenever I connect one to the computer (which has the 'master' iTunes), I set them up separately so no one device tries to overwrite the computer. I rarely connect to the computer anymore - I just use wifi to download stuff onto the devices which doesn't affect any other devices.
One thing though - check there isn't a 'Contacts' list on the old device that may need to be saved/synced to the new device first.
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