Did you get it done from Malik auots (The one near the chowk).
I swapped a QG15DE in my B13 Nissan. Purchased the engine from some other guy and swap was done on Malik autos workshop.
Regarding techncial/wiring issues, you'll have to probably sort out yourself, as these electricians are good for starting the engine only.
Experts @star2, @spectra, @SER_GTR may help you in this regard.
@experts: MY ECU is also that "ZZ", so most likely, this guy got a 3-row ECU