Getting a raise after finishing your MST? (Tax)

At PwC, new hires with an MST make 10k more than new hires without one. I started with only half of mine finished, and finished the rest during my first year. About to have my comp talk with my partner, is it reasonable to ask for the bump up to make what the rest of my peers are making with an MST?

I spoke to HR, they're giving me very mixed signals.