The problem is, that actor is now 20 years older than he was in at least the first flashback scene in season 1. Likewise the actors that play everyone else. I'm betting they just go with someone different.

"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea