While there are similarities between Oreo Cakesters and whoopie pies, they are not exactly the same thing. Oreo Cakesters are a packaged snack cake made by Nabisco that features two soft, cake-like cookies sandwiched together with a creamy filling that is similar in flavor and texture to Oreo cookies. Whoopie pies, on the other hand, are a traditional dessert that originated in Pennsylvania Dutch country and typically feature two soft, cake-like cookies sandwiched together with a creamy filling made from butter, powdered sugar, and marshmallow cream.