No. Layering your hair is done with scissors, whereas thinning is done with shears. Also, layered hair is basically when you have hair of differing lengths, for example, shorter on top and longer elsewhere. Layering hair can remove weight, but it's also done to give your hair shape, volume, and texture.  In contrast, thinned hair is when some of the volume or depth of your hair is removed to create a softer look.