I didn't actually try it (I'm testing another mod at the moment), but I don't see a reason why it shouldn't work. Technically, the mod already "works" with 3.13 even when you don't apply my changes - you just miss out on some of the fixes and changes made in patch 3.13, because the FexFX mod overwrites some 3.13 changes with the old values from 3.02/3,03.
The changes i recommend just make sure that you get the fixes and changes from 3.13 as well. I haven't tested it in-game, but I don't see why it shouldn't work as it's supposed to. Did you run into any problems?