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