Though they are similar there is a difference between these two appetizers. They are both sliced bread traditionally served with a variety of toppings & Italian ingredients. Crostini is a smaller bite of thinly sliced bread & can be toasted or untoasted. On the other hand, bruschetta is typically rubbed with fresh garlic & drizzled with olive oil before toasting - then the toppings are added. This is the difference between a crostini vs a bruschetta.