No it’s not dollar for dollar.
Have you run the net price calculator that’s on the college site using that 2019 W2 data and tax return info? It’s going to be a rough estimate…because you are wondering about a future year…but try it.
W2 income typically yields better results with NPCs than 1099 self employed does.
I’m not sure why you think this wouldn’t at least give you a guesstimate of what your net price would be with the W2 income from 2019. An estimate…but it would give you at least some idea.