Should supplier and site be same on both credit memo and standard invoice?

Should supplier and site be same on both credit memo and standard invoice, so that the PPR will select the invoices and process the payment?

I have a standard invoice ABC with supplier SUP1 and site S1. and the credit memo ABC_CM supplier SUP1 and the site is S2.

Standard invoice is already in paid status. when I submit PPR to pay credit memo, it is not picking up.

Also confirm the below case:

For a supplier, 1 standard invoice is already paid. if we place a credit memo for the same supplier, will PPR pickup the both the invoices and process payment?