Crediting rental car accrued points to hotel/airline program

Voyaging Doc

Level 2 Member
I've used my most recent Avis rental abroad to credit my Iberia avios account so that I can unlock transfers BA Avios <-> Iberia avios without having to waste 1k MR points for a transfer. I would like to do the same with my SO's iberia account. Is it possible to credit a different loyalty member account my next rental or do they verify that the loyalty account details match the renter's?
 
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