Paulie said something interesting in the post fight interview after his fight with Khan something along the lines of I've fought a younger version of myself (I disagree) So list a fighter who fought a similar fighter of themselves toward the end of they career.
Holmes has said his final successful defense against Carl Williams was precisely that, an instance of taking on a younger version of himself.
After his fight against Jimmy Young,Muhammad Ali said that Jimmy reminded him of himself. Now that is a SUPREME compliment !
Marco Antonio Barrera said Pacman reminded of himself at 24 GOING INTO their first fight which was probably not a good sign in retrospect. While Manny is a southpaw and he and Barrera employed radically differant styles I think Marco was refering to Manny's never say die, tit for tat mentality.