No, crème de cassis and blackberry liqueur are not the same. Crème de cassis is a sweet, dark red liqueur made from blackcurrants that is very popular in France and different parts of Europe. It is typically utilized as an ingredient in cocktails or as a topping for desserts. Blackberry liqueur, however, is a sweeter type of liqueur that has a rich, fruity flavor derived from blackberries. It can be served independently or used to create unique cocktails and recipes.