Can Mexican brandy substitute for Spanish brandy?

There is no such thing as "Mexican brandy". Brandy is a kind of alcoholic beverage, that is made by distilling wine or must. This results in a liquid that has a higher concentration of alcohol than wine. The liquid is then typically aged in wooden barrels. Brandy is most commonly made from grapes, but it can also be made from other fruits. The word "brandy" comes from the Dutch word "brandewijn", which means "burnt wine".