Moles are black or dark gray and have big pink extremities (in order to dig fast), some have weird looking tentacles around their mouth, and they are totally blind as they only live below-ground. Voles are similar to hamsters, the are not blind as the live above as well, and the look like mice with a shorter tail, with a grey, golden or brown fur. Just use google images and type in "mole" and then "vole", and then compare the images.
Different species, but one thing they have in common: they are loved by cats and hated by gardeners as they both dig holes in the ground. ^^
(Sorry for being a smartass, just wanted to clarify things )