The shipping address provided via PayPal does not necessarily have to match the buyer's registered eBay address, although it mostly does.
Keep in mind that as a buyer goes thru checkout using PayPal they are offered the opportunity to change the shipping address. If they choose to mail to aunt Doris then the shipping address will not be the same as their eBay address.
The important thing for seller protection is that you use the PayPal address if indeed that is how they pay.