update apple credit card billing address

See the following from Manage your Apple Card account - Apple Support

View or edit your billing address

1. Open the Wallet app on your iPhone and tap Apple Card.
2. Tap the more button .
3. Under Billing Address, tap your address.

To change your billing address, tap Update Billing Address and provide your billing address information. When you enter a new billing address, use the two-letter abbreviation for your state. A physical address is required to apply for Apple Card and to receive your titanium Apple Card shipment.You can also use a military address.

The data in iTunes is different and unrelated to the Apple Card (a new Credit Card from Apple and Godlman Sachs) or your Apple Pay address

To change the iTunes store billing address follow the steps here: Change, add, or remove Apple ID payment methods - Apple Support

See here: Manage your Apple Card account - Apple Support