The 4wd t-case is integrated to the transmission. All 'Zus are passenger's-side drop. The 4wd tranny has a hydraulic clutch whereas the 2wd was cable clutch... that is the only thing that keeps a 4wd tranny/t-case combo from being bolt-on (except possibly crossmembers).

The output shaft size and spline count on the t-case matches the input of the t-case from an auto (married style case). If the same is true of the output on the 2wd tranny, you could in theory custom adapt a t-case from an auto to the 2wd tranny; but that is all speculation and would require custom fab work regardless of whether things line up or not.

What is his goal/objective with this build? If he's just trying to make a stock 2wd Amigo into a stock 4wd Amigo, its not worth it.