ok, even if you configure with the same IP address you will likely have to check and reenable some (if not all) settings, if recording is not enabled when you do reenable it the recording will continue on the same channel in Playback. (e.g. if you were recording to channel D1 and the new camera is now connected to that channel you will see a gap in the recording and then the new recording will appear in the same channel)
The majority of the settings are saved to the camera so when you swap them over most settings will have to be adjusted or enabled.