You have to qualify with the Glock 19 and have it specifically amended to your Nevada CFP since it's a different model of firearm. The semi-auto specific portion states it's for make, model and caliber. Failure to do so and you get caught will result in a felony charge.
You are only required to get a Clark county blue card if you are a Clark County resident or you are in Clark County for over 60 contiguous days.