LP2 is Midnight Purple, which is a somewhat rare colour to get a GTR in... so if your car is currently Midnight Purple, i'd say that the car was originally supposed to be a Black GTR (KH3), but then the new car buyer asked for a different colour and options when he bought it. Usually the order goes back to the factory and a car is picked off the production line and modified.
Having the kanji and brand printed and the rest engraved is normal. I'll see if I can decode the model code so you can check with your car, but I have a strong suspicion that the difference will be upgraded parts.
In the meantime, what's the current colour of the car?