"Equal pay for equal work" is an impossible notion to start with. Even more so when "equal" is State defined.
I used to work next to a woman who did the same "work" - business software development. Same age within a couple of months, same time at the company, again within a couple months. I have a degree, she does not. Yet - she was paid significantly more than I was (absolute fact, I supported the payroll system). Yet - she was not laid off in the same round as I was (was never laid off, in fact).