Touchless Payables: Changing match option from receipt to order

Summary:

In our journey towards a touchless P2P experience, we would like to change our Default Invoice Match Options from Receipt to Order on all our purchasing line types. Thus, all new POs will have Invoice Match Options = Order and the invoices will inherit this from the PO.

I have a dilemma though regarding the existing POs. My assumption is that all existing POs will retain their match option as Receipt and all invoices which will be linked to them in the future must be matched to a receipt. The change in defaults will not affect them. Is this true?