Can i change a 3cyl to 4cyl engine in Daihatsu Charade g200 1994?

Unless a 4 cyl 1.6l is made for your gearbox, then you will have to change it. The bolt pattern must match up. If I am not mistaken, Daihatsu did not make a 4 cyl for this car. You will need to change the engine, gear box, computer. drive axles, engine mounts and the wiring harness.