While looking at a couple of different discount honda sites i am confused on ecu's. I may need a new ecu for my 2002 n3. Part number that is on my current ecu is 38770-hw2-622 9770-201374 A. That part shows like $900 and $1200 and some sites. Then pgm-fi unit part number 38700-hw2-305 is $300. Anyone know why or is the second cheaper part replacing the first?