I’m not sure about other companies, but the big tech companies pay exactly the same regardless of whether you’re on a work visa or not. At the company I work at, bonuses and raises are formulaic based on performance, and the performance discussions/calibrations for ratings and promotions don’t take visa status into account at all (I’ve participated in them).

Smaller companies are less ethical, but they get a much smaller proportion of the H1-B visas.