ok here's how it breaks down:
the N1 model was a GTR that was sold predominantly for use by shops to make race cars. so it came with no air con or heavier projector type headlights etc.
so you have:
S1 R32 - Povo Pack headlights (what you've got)
These came standard on all R32's (GTR and non GTR) in the first series
S1 R32 - Projector headlights
These were factory optional upgrades
S2 R32 - Povo Pack headlights (same as S1)
These came on GTS, GTSt, GTS4, GTE and GXi models standard
S2 R32 - Projector headlights (similar to S1's but the plastic moulding around the projector are slightly different)
These were equipped on Type M's, Type G's, Type S's etc and all GTR's, and available as factory optional upgrades.
ALL GTR's had a grill and not an extended bonnet lip, so they needed some way to hold these grilles in. Therefore they made allowances on BOTH pov pack and projector headlights for metal clips to hold the grilles in.
N1 GTR's, being equipped with stock pov pack headlights (which were usually turfed and replaced with a fibreglass or CF panel or duct of some sort) had these clips on them.
Therefore N1 GTR headlights are actually pov pack headlights with GTR clips.
So I hope that clears up the confusion. Anything else you may come by is custom made, be it by Nismo or any other company.