Amex rewards referal - Clarifying cross cards payout

I read many post about Amex reference bonus but could not find a clear answer to this:

If a Amex Gold cardholder make a reference for an Amex business platinium, does he get 5k or 25k as reference bonus?

Conversely, as Amex business platinium cardholder, do you get 25k for any reference to similar card (Amex Gold, Amex Platinium, Amex bisiness platinium) or it the payout associated to the card selected by the person referred (5k, 15k, 25k).