ieee 1394a header

I have a Gigabyte GA-MA790FXT motherboard that I'm trying to connect the pins on the front panel of the case I"m using.
There seems to be a slight difference in the Case plugs on the header cable and the connecting pins on the M/B header plug .
The plugs on the cases cable are identified as such


TPA+
TPB+
TPA -
TPB -
VCC
Grnd
Grnd

were as the M/B header socket has the following pin identifications

TPA+
TPB+
Grnd
Grnd
TPA -
TPB -
Power (12v)
Power (12v)
no pin
Grnd


Will the leaving out of the second power plug and extra ground plug make any diference to the connectability and operation of the single front 1394 socket?