Needing to replace my front bumper cover on 2012 G37X, non-sport. I would like to switch to sport bumper. Will the Non-sport lower grille fit so I can re-use it? There are 2 different part numbers for the lowers, but just the last digit.
The upper grilles are the same right?

 

Uppers are the same, lowers are different. I'm only comparing the part numbers as you are.