Can I sync shipping address changes to the subscriptions automatically?

Yes, the Seal Subscriptions app has an option, which allows you to sync the changes customers make to their shipping address to all of their subscriptions.
For example, if a customer updates a shipping address in your store and they have a subscription with the same address, the system can sync these address changes to the subscription.

You can turn on this feature in Seal Subscriptions > Settings > General Settings > Shipping > Automatically sync shipping address changes to subscriptions