By manually pulling screenshots and comparing, I _think_ I've at least determined that palette index 70, maps to 242. And then looking at Nyerguds FilterCreator files, I see there a units.mrp file, which might have the info I'm looking for? Because it has this line
Indices=240,241,242,243,244,245,246,247,248,249,250,251,252,253,254
which has 242.
So does that then mean 68 maps to 240, 69 maps to 241, 70 maps to 242, etc?
I'll keep manually doing screenshots compares and see if this pans out.
But anyone feel free to jump in with help.