Are Diane Neal (law and order SVU) and Dana Delany (actress Tombstone, Desperate housewives) Related?

So I looked it up and i cant find anywhere that it says they are related. But everyone else says they are. The only thing that makes me wonder is that they look alike and it says the both have sisters. What tells me they aren't is that there are 20 years in age difference and I looked it up. Plus im never wrong.