Yes I confirm, the Faderfox adapters use the same wiring as Arturia, so it's not compatible with the Korg ones.
I must say that I'm still experimenting with using the with MIDI controller... controlling the volume with the faders is nice, but you get jumping when switching from one part to another. So it really only works well as long as use one part (and one bank) only… which can be a bit limiting. Or you have to set up parts in a way that you know how to transition from one to the next (eg. you finish a section moving the volume down to zero, then switch pattern/part and have that part start with the volume on zero so you don't get any jumping).