If you mean for example the average of all programmers inside Microsoft compared to the average of those on H1B, no I can't since that data isn't public.

The H1B database is public and you're required by law to register every H1B hire in it. That's the data source I was looking at. Companies don't typically advertise what salaries they pay employees if they don't have to.

I can tell you that Microsoft (and I'm sure the same holds true for Google and others) paid everyone the same, regardless of their visa process. Your financial package negotiation process was completely separate from your immigration status. Companies like Microsoft and Google sponsors a lot of visas because they try to find the best engineers, wherever they may be and then get them here.