based on the date. More likely the change happened when they finally ran out of the old tanks and swapped processes at that time. IIRC pintleless injectors or something similar can be found on some late assembly-date 94's....but we all attribute them to 95+. No reason to throw out the original design parts just because this date or the other comes around.
"I torch my soul to show the world that I am pure deep inside my heart...." --William Patrick Corgan