Thats a very good point!!!
If your cars Post 2000, then you'd probably have to change the loom and ECU.
If it is a post 2000, you'd better off going for the 1.4 CGA3, and maybe this ECU can be fitted, although will require NATS re-programming. Although Ed would be a better person to ask about this as he's worked with post 2000 Micras!
mine is a 2000 face lift just before the face lift face lift and it aint coil pack so it is possible but a faff on im gettin a 1.3 pre face lift off a lad from work so was gona put the engine in mine but if its to much work to be done i dont think i will bother