In the literal term, I think it is inequality if one is just comparing the salary numbers. BUT, once variables start to get added(location, personal preferences

In the literal term, I think it is inequality if one is just comparing the salary numbers. BUT, once variables start to get added(location, personal preferences, the availability of replacements) then you start getting into murkier territory. There are also significant impacts of standardizing pay across regions. There will obviously be a flow of people from HCOL > LCOL/MCOL areas, consumption will increase, local inflation will happen...these things benefit some groups and hurt others. No idea how it would all shake out in the end though.