From what I see, the two are compatible. Have you tried connecting the front panel audio to determine if it works?
No, I haven't tried because I don't have my PSU yet. Also, I'm afraid of damaging something if I plug the wrong thing in.
I know that the naming for each pin won't be exactly the same, but things like this seem really off: PORT2R -> MIC2_R
. Those aren't even close.
Btw, (not sure if it matters) I should add that the wires coming from the front audio are split into two plugs, one for AC97 and one for HD.