I wouldn't think so, because they target different chemicals, but there may be some odd interaction where say campden is inhibited by the presence of carbonates, or vice versa... I don't think so though. campden targets the chlorine and releases it, and carbonates are a different compound that breaks up w/ the CRS and creates new balanced water state.
Fermenting/Kegged/Bottled NONE :( I moved to the NW and haven't had time to setup my brew rig since! (but hey, I'm in the Pacific NW so there's so much awesome beer I don't need to brew it as much hah!