You can check their financial aid web sites, but many schools do not state anything specific. So you may need to ask them specifically.
Some schools have limited stacking, where scholarships replace student loans and student work expectation or work-study first, but then reduce FA grants. For example:
https://financialaid.stanford.edu/aid/outside/
https://students.ucsd.edu/finances/financial-aid/types/scholarships/
https://financialaid.usc.edu/undergraduates/admitted/scholarships.html