Other than the fact that both are placental mammals, they are completely unrelated. Voles are rodents (Order Rodentia) in the mouse and rat family (Muridae). They are essentially diurnal, short-tailed mice that tunnel through grass. They eat vegetation, seeds, and some insects. Moles, on the other hand, are insectivores (Order Insectivora) in the family Talpidae. They are more closely related to shrews than to voles. They are fossorial (burrowing) animals that eat only invertebrates such as worms and beetles. The vole and moles in your area are shown below.