I have changed my Bahrain D/License to Qatari D/License. I believe you can do the same if you have your Original Saudi License with you subject to you have a valid Qatari Residence Permit. You will have to get 1-Noc (in Arabic) from you company/sponsor along with Computer card of your company , 2- eye test along with the application (eye test center will provide it for you). Go to any eye clinic and tell them you need eye test readings for D/driving license. , 2-3 photos required. Stick one photo in the application. Credit card required to pay 250 QAR @ traffic department (it takes few minutes to process ) , Your Saudi license will be return back to you once verified by Traffic dept. Best of luck