There is no such thing as "NA1 headlights" or "NA2 headlights".
NA1 is an engine code for the 3.0-liter NSX, which was sold in '91-96 with a five-speed manual transmission, and in '91-05 with an automatic transmission. NA2 is the engine code for the 3.2-liter NSX which was sold in '97-05 with a six-speed automatic transmission.
There have been two versions of headlights on the NSX. The '91-01 models, including NA1 engines and NA2 engines, came with retractable, conventional bulb headlights. The '02-05 models, including NA1 engines and NA2 engines, came with fixed, HID headlights.