If AMD Store has a limit to the amount of GPUs a Customer can purchase that means that only one GPU card per PERSON or HOUSEHOLD.
If you use the same PayPal Account as before most likely your second purchase will be cancelled since PayPal account is in your name or has the same banking information under your name.
You can take a chance and see if AMD Store will let you order another GPU card with the same PayPal account but different address.
All of the above is just my opinion on AMD Store limit of one per Person or Household limitation on certain AMD Hardware sold.