Equity? You mean equality (and that's still about rights, not pay.) Equity is just a stake in the outcome at all.

Equality: starting out at the same position, for example we have equal rights under the law

Equity: winding up at the same position, for example when everybody in a race wins the same medal, regardless of how hard they trained or how talented they are.

An apocryphal story about equity:

https://www.tnellen.com/cybereng/harrison.html

There's no definition of equity that I can find that returns that result so we'll just have to agree to disagree.

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Equity in this context usually refers to the concept of Social Equity, which is interested in equality of outcome

https://en.wikipedia.org/wiki/Social_equity

The extent to which equality of outcome is pursued and for which groups are traditionally factors, but the overarching idea is in pursuit of equality of outcome.