Boba Fett was around during the Star Wars Galaxies era, long after the Old Republic. A time when every bounty Hunter realized they could use something bigger than just a pistol (angry stare at SWTOR), when bounty hunters could use carbines, rifles, and light lightening cannons, and could travel using their jetpacks...
The bounty hunters in swtor are just hardened smugglers, Boba Fett was a true bounty Hunter in swg... A mix of powertech, merc, sniper, and commando.