ECU need advice
 

long story short, i have a tuned 62 ecu in my 180sx and for some reasons it got fried, to fix that i bought a tucked harness from wiring specialties and i got another 62 ecu that "works" with my car but the tune isnt the same, can i simply swap the 20pin chip to get my old tune back on the new 62 ecu?

If you mean swapping the 40 pin daughter board, which has two 28 pin chips, then yes.