Good job I knew what it was for
AFAIK there isnt a "Nismo" strut per-se, they are all the same just the Nismo one has a nice emblem on it. Unlike other Nismo products, this is just the Nismo 370z so has a bit of badges everywhere. The strut is no different to a normal one.
The engine cover is red instead of silver, which suits my red interior
EDIT: Actually, the Nismo strut is slightly different, a bit more reinforced than then standard one, they added a couple of bars to the normal one.