When switching pans with an RCBS scale :
The pan "Hanger" has a screw in the bottom that has a compartment under it with some small weights (some VERY small pieces of metal). if, when you get a different pan, it does not weigh close to the same as the one that came with the scale, you will need to remove the screw and add or remove weight from the compartment. check with it re-assembled, including pan, AND with sliding weights (or micrometer poise) all set to zero. when you get the amount of weight right in the compartment, it will zero on a level surface, with your new pan.
hope this helps.
P.S. when using this type of pan - hanger setup, I have found that it is necessary to periodically remove the pan, then unhook the hanger, and dump the hanger out, as it is possible for a couple - three grains of powder to get hidden in the screw slot, under the pan. keep an eye on it.