I remember reading about these games in David Mariness excellent book on Vince Lombardi “When Pride Mattered”. Lombardi was very upset about losing to the Eagles in the ‘60 NFL Championship that he used that game to motivate the Packers to win the championship the next year and the Packers under Lombardi won the rest of their championship matches.
the Giants were about as dominant as the Yankees in those days weren’t they, except thet never won the title.
A reporter once asked Lombardi what was the secret to good coaching. Lombardi replied, "Get good players."