Both editions have d66 event tables for the careers they cover, as well as alternate d66 event charts for the core book Army and Marine careers. So that's a value-add over the core book 2-12 tables, even if I never used the rest of the book much.
Those event tables found in both books look to be the same, carried over, but as WHU says those other careers weren't carried over. If your only interest is careers and events consider tracking down the very first edition, although it's otherwise considered the weaker of the two versions.
1e unique Mercenary careers (and specializations): Cadre (Basic Trainer, Physical Trainer, Field Exercise Leader), Commando (Raider, Technician, Spec Ops), Guerrilla (Terrorist, Saboteur, Assassin), Security (Bodyguard, Ship Security, Site Defense), Striker (Rifleman, Sniper, Breaching Troop), War Monger (Gun Runner, Arms Dealer, Gun Slinger).
I vaguely recall thinking when I got the book that some of those drilled down too much for my taste (Cadre, Commando and Sniper could have been specialties of one Mercenary career, for instance), but flipping through it now I'm appreciating the extra six event tables.