you really do need to check the pin-out specs for the 2 different headers because they could be different.
That said, by 9 pin I assume you mean a 2x5 with a missing key pin. for a total of 9 pins, which makes up a dual internal usb header.
Either side of the header is one usb board with the extra ping being No connect or an extra ground.
The DG45Id list its pin out in the TPS http://downloadmirror.intel.com/15991/eng/DG45ID_TechProdSpec.pdf page 54