Without opening things up to see, does it matter what color I get?

I notice they come in pink or red, is there a difference?

When I was checking on buying injectors, the parts guys (dealer and other places too) wanted to know the year, make, model and whether my injectors had a blue dot or a black dot. They never asked me what color the injectors were, so I don't think that is a determining factor in what injector to buy.

Pink= VG30E injector

Red= VE30DE injector

You need the pink ones..IIRC the oem blue or black dot injectors have been superseded into one on aftermarket injectors, not sure on this, maybe brian will chime in with true/false.

89-92 VG injectors are the same. Both Blue and Black dot injectors were superseded to one part # at all levels when new. (used/rebuilt is questionable depending on supplier)
93-94 VG injectors are still in 2 seperate #'s (green and yellow)
92-99 DOHC maxima all take the same injector.
89-94 VG are all pink topped
92-99 DOHC are all red topped.