I think they are the same thing. The white pad is Ehfisynth and is thrown away each filter cleaning. The blue pad is "coarse pad" otherwise known as open cell sponge, and is cleaned and reused for years.
They are identical. One is preformed to fit and the other is more like floss. I have used them both and they each work great. You can also use pillow batting which looks like cotton. I buy it in bulk at walmart, a huge bag is like $5. Works just as well.