Two options:
1. Ask AZ or whoever (TA) sold you the ticket.
2. Call KE and ask.
AFAIK you can't look things up on the KE website from the ticket number (combined with passenger name/date/flight number etc.) but KE phone agents can. You should be able to see the ticket on the Saudia website, but IIRC that doesn't give you the PNRs.