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Did u use your 5.7 wire harness with the 6.4 pcm and bcm or just the 6.4 pcm with 5.7 bcm

Hey, my car is a 2014 charger rt, i swapped my engine from a 5.7 to a 6.4 im trying to figure out what's the easiest way for me to convert my 5.7 tune to a stock 6.4 tune. do i have to copy...