Here is what I've got from SAA:
"We acknowledge receipt of your query dated 08/10/2010 and are pleased to be of assistance.

Kindly be advised that we do not match status from different carrier. If you are a gold status with Voyager , you can not be automatically gold status with Delta you need to earn miles with that specific carrier to be on the certain status. For further assistance contact our call centre on 011 978 1234.

For ease of reference in future correspondence regarding this enquiry, please quote your case reference number as provided above.

Regards


Voyager Support Services"