it depends on the BOSS for sure.
Like for Americans, British and Asian bosses, rate can be different giving filipinos the highest.

For arab bosses, its the arab people getting the highest.
Other than that, the number of years experience, the way you speak and the place where you obtained your degrees/certificates count a lot.

For sure, I am not giving the same salary for the same position without considering the latter. To me it gets more bearing. No matter what nationality you are. Think about that, make the comparison then move on and dont get jealous of the other people's salary, afterall, it was in agreement with you before you started working.