People have killed ducks long before the advent of the modern camo craze. & today's ducks are no smarter than their ancestors were.
The most important thing is to sit still & conceal any exposed skin. A duck can pick out your face or uncovered hand moving from a long way off. You'll do just as well wearing a combination of drab colors as you will with any of the modern camo patterns.
Mossy Oak, Realtree & the like were invented to fool hunters, not game.