You brought out more similarities than I had considered existed. But Sack had a different personality than Gotti. Gotti didn't have the patience to be underboss/consigliere like Sack. While both were hot headed, Sack generally assessed the situation better from a strategic perspective.

The other big difference was Sack's attitude toward women was much better than Gotti. Sack was devoted to his wife and did not keep a gomarrah. Gotti openly saw other women, including the niece of his former mentor (Neil Dellacroce).

I think the comparision of the egos being similar is very valid. Sack became unreasonable with the "mole comment" and then after becoming boss. He basically said it was beneath him to meet Tony now that he was boss.