I didn't run into any issues. I do see the new part number for the 2018 but I'm unsure what would have changed to make it not compatible.
I will say that with both these and the STI pink spring they seemed a bit wider of a coil than the base of the shock but the way the spring fits onto the base, it sits in a groove and the portion of the spring that makes contact with the base is doing so in that groove, so it's not going anywhere.