No. They do work differently. This recipe calls for both, and that's because the high speed blender is great for making oats into a flour (put them in a food processor and you'll just get oat meal), and the food processor is really good at mixing the peanut butter and dates until they are smooth (the mixture would probably get stuck in a blender). You can find more info on when to use a blender vs. when to use a food processor here.