Plot hole?

Lupertazzi crime family had a cooperation with DiMeo crime family for years. Carmine Lupertazzi and Paulie Gualtieri were old members of these families. They were both made men. The first became a boss, the other became a capo. They were present in the same events sometimes. Why Carmine didn't recognise Paulie at all when the second tried talk to him? Do you think is that a plot hole?