Having multiple PP cards is a benefit that you should keep but LABEL them so that you know which card company is which.
Some PP cards are limited in guest access (unlimited, 2 max, none, etc)...
So it pays to use the correct one for you lounge access.

Take a look at this video on comparison between PP lounge privileges between different card companies:


I just came back from Asia and used the PP in various lounges - but at one airport (XMN) I had to change 2 times to find one that was not full of people.

PP charges the card issuer connected to the card for reimbursement because they either swipe your card electronically or else they manually take an impression (old credit card days)...

So which ever PP card you use, they charge the card issuer.....