Only difference I can think of is that hasn't been mentioned is that Sack was a White Collar guy where Gotti was always blue collar but I reckon Johnny Sack in a way was a Gotti-Castellano hybrid
Like Gotti -Wore nice suits -Always did business from a bar -Had a temper when things weren't going his way -Died in prison of cancer
Like Castellano -Lived in a palace like house -Construction was his main intrest