I have a 2007 GMC Sierra 1500 LTZ with the 5.9L vin M (8th digit) LH6, motor is no good. Looking for replacement. Is the only difference between the lh6 and the 5.3L vin 3 lc9 flex fuel? If so would I be able to just swap my fuel rail and injectors and be the same engine at that point. Would I have to change anything with the ecm would it match up. Found a replacement motor in both versions told different info just looking for help lc9 is cheaper with about 55k less miles on it. From my research ecm pcm control module is all the same so hoping someone can just confirm the fuel component changes and I can get a better deal