The other thing to be careful of is the density of the various salts. You can be safe by going with total weight, but the different salts have different densities, and 1 cup of one will not weigh (or season
) the same as 1 cup of another. There are tables somewhere that have conversion tables for the size/weight differences of different types of salt. It wouldn't matter I could find them, because I'm too computer-challenged to know how to add a link, but I'm sure one of the brighter folks around here could.
Not so important with dry applications, but good general salt info!