The GTR Engine (BPD) is far more expensive (rare) for a half cut but you won't have to change your turbo, injectors or ECU. They will make 170kW at ALL 4 with just an intercooler, POD and Exhaust (Friends car).
The factory ECU has maps for up to 18psi, Big T3 size Turbo, Different Injectors, better flowing plenum and a few stronger internal bits
The BPT GTX and TX3 are exactly the same except for a Ford Tapper cover vs Mazda one. Big difference is just the ECU with the GTX tuned for Japanese Fuel - 134 kW vs 117 kW.