You shouldn't need to be unhappy with your salary to expect to be treated fairly relative to your peers. Arguing that jobs are different is moot. Even two very

You shouldn't need to be unhappy with your salary to expect to be treated fairly relative to your peers. Arguing that jobs are different is moot. Even two very different jobs for the same title with the same tenure are in the same rough ballpark. It's not a justification that it should be impossible to get the data.