There is no any support between the salt of these mods, so it's not possible to switch between the difference recipes of the 3 mods and use them in the mekanism machines.

Salt uses the ore dictionary, it's up to other mods to add their own support.

I just tested and the salt from Pam's seems to work just fine in the Chemical Oxidizer to make gaseous brine. Can't speak for SaltyMod as I don't have that in my pack.