K40 is at the very front, with a few fuses plugged into its top and a number of smaller (3-6 wire) connectors on top as well.

N10-1 is the largest piece, at the very rear (with the electrical connections on the left side). The IFI control module (engine computer - with the electrical connection on top) is immediately forward of N10-1.

Don't swap the engine control module from another car; it won't work. I'm not sure if N10-1 can be swapped. K40 shouldn't be a problem, if the cars are outfitted identically; check the part numbers on the modules.