I'm not at my computer right now, nor do I have that particular mod to hand, so I can't check, but i'll do my best to answer your question...
All you should need to do though is copy whatever changes Redhawke make to the file in his mod over to the one in your Override folder.
Then, if there are new rows which are used by new GFF files, just change the Row Index in the GFF to match the ones in the 2da.
Simple enough. Though as I said, i'm not at the computer at the moment and can't examine the mod, so what i've said may be completely irrelevant.