What aspect of older compensation structures can lead to pay differences even for employees with the same job title?

Answer

One employee being hired when the headquarters was in a higher cost-of-living area years ago.

Disparities can arise because an older structure might include historical factors like location differentials, meaning an employee hired years ago under different policies may have a different rate than a recent hire under a new, location-agnostic policy.

What aspect of older compensation structures can lead to pay differences even for employees with the same job title?
confidentialitysalaryemploymentTransparencywage