The 18-20 base, and the N-Line grilles aren't the same. However the 2018 Sport uses the same grille size/dimensions as the base.
These are just generic pictures offline. However you can tell the difference between the 18 sport, 19-20 N-Line grille, and the 19 base.
Edit: If you want to try it out, it says to contact them. (i'm sure you'll get some kind of discount) Remember... you have to destroy your old grille which just the part itself is anywhere from 400-700, which means if it doesn't fit then you're out however much.