New Apple Watch setup
I didn't use Express Setup, can I still transfer the settings from my old watch to my new one?
Apple Watch Series 8
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I suggest you unpair the watch and set it up again. See step 4 in:
Set up your Apple Watch - Apple Support
If you've set up another Apple Watch with your current iPhone, a screen appears that says Make This Your New Apple Watch. Tap Apps & Data and Settings to see how Express Setup will configure your new watch. Then tap Continue. If you want to choose how your new watch is set up, tap Customize Settings. Then choose a backup from another previous Apple Watch to restore. Or tap Set Up as New Apple Watch if you want to fully customize your new device's settings.