Yes, If a Brazilian studies the Spanish language it`ll become very simple for him.
I studied it for about a year but I stopped it and I have not practing it anymore. What happens to me is, I can read it well, I have a good pronunciation but I cannot talk or make sentences because of its grammar.
I speak Italian and I usually mix it in Spanish lol lol...
Did you know that South and Central America countries which have a different Spanish from Spain are called CASTELHANO in Brazil and among those countries? In Spanish is Castellano I guess lol.
I studied Castelhano ( from Argentina) and Spanish from Spain.