DIYAutoTune got back to me, figured I'd update this if anyone was curious, or to help anyone looking for the information in the future.
Quote from Matt at DIYAutoTune:
"The two ECUs (NJ8994 and NS8994) only differ in their factory jumper
settings and the tune they ship with; they're otherwise identical. So
all you need to do is change the internal jumpers from the "JDM S13
W/SR20DET" to "All Others" in this illustration, and load the KA24E tune
from this link ... You won't even need to modify your wiring."
I'll attach the image he sent me, as well as the link for the base tune.