Someone else sent the following response, indicating that they are two different sizes.
October 7, 2013
I like that these boxes came as a set of nesting boxes in two different sizes. It makes the price very reasonable, especially when you realize they are not made of super strong material. The boxes are a tad flexible which does not allow for storing very heavy things. I am using them to store mason jars and other household wares but have to be careful about overloading the weight. I love the colors and that it has a small label already included.