Yes the calipers are different. No brackets are required.
It's very easy. Just go on Rock Auto and order Legacy GT Calipers front and rear and of course get rotors and pads. Everything will just bolt right up. Then you can send back your old calipers for a core refund, so it ends up the calipers are only like $50 each.
All the parts cost is like around $500 (after core refund)