According to the motherboard manual, both USB connectors are 9 pin. One is labeled USB910 (for ports 9 and 10) and the other is USB1112 (for ports 11 and 12).
From the instructions it sounds like there is a Q-cable you need to plug into the motherboard then plug the front panel usb cables into the Q-cable. The list of contents only says it comes with one Q-cable.
It also looks like you can plug 4pin usb cables into them and the 5th pin is just not used.