Is there a difference between Dutch and NL? Both kinda refer to the same as far as I remember :) Holland and the Netherlands, that may be what you meant? Last so many decades, or even century, the Netherlands is also called Holland. However, before the Netherlands was born, two provinces in the Netherlands formed a separate 'country'. I say country in brackets because in those days we didn't really speak of countries. Back then Holland (the two provinces of the Netherlands) was owned and run by a Duke.
Anyways, so far the history of NL where the peeps mother tong is Dutch :)