All the h1b salary data is public. If you search any of the Faang companies, the salaries seem in line with market rates. I would also love to see a study that shows otherwise.
I don't think the stock options would be public, since it's discretionary at most companies, and varies from person to person. Anecdotal as it is, from my experience at Microsoft the stock sign-on and annual bonus don't correlate with visa status.