The only thing different is you have urea, rest of the world does not. Ours still has DPF, DOC, Throttle, EGR etc.
I'm starting to like the E20 ECM though, WBO2 sensor from factory, knock sensors for noise control, great set of PID's to log, 6 injection events if needed (two pilot, Main and 3 x post), target AFR in closed loop all the time. Pretty sure the Family Z uses 12V injectors too, Pretty sure the Bosch system on the US Cruze is high voltage, I think you would be mad to consider the swap, however, I think the E20 would make a great ECM for conversion setups.