One is a standard front bar and the other is dealer option or aftermarket front bar by Nismo.
The difference is the Nismo bar has larger air ducts and an air outlet for the Nismo oil cooler location. The Nismo bar also has a protruding nose lip.
There is another Nismo front bar which is getting more common in Japan which is the fiberglass Z-Tune copy bar.
The difference between a non-Vspec and a V-Spec, V-Spec II, M-Spec, front end is the lowest lip section which is not present on the non-Vspec.