In Japan, employees mostly start at roughly the same salary - somewhere between $20k and $30k per year, regardless of position, with salary increases reflecting time spent at the company.

Expats often move at the request of the company, and not into entry level positions. Employees who are asked to relocate would expect to do so in exchange for a raise (particularly if their home country has higher salaries and they expect to move back eventually), so expat salaries tend to be significantly higher.

Given that, I wouldn't necessarily expect expats to be offered the same benefits as native Japanese employees.

I think in average expat salary is higher