Who decides to award us Scholarship or Grants? Fafsa or Financial Aid Officer.

I know they use the fafsa information for the awards. But is it possible if they award one person with more or less grants while they both have the same EFC and they sent their fafsa at the same time ?

FAFSA only determines your eligibility for federal grants and loans. The university determines who will be awarded any institutional aid. The school is not required to award you anything other than Pell grants and federal loans.