Ok. New question.
I have 9 chickens. They eat a combo of all flock (thinking of changing because they aren't super happy with it) and grower (which they love but is whole seed type feed and is really best served fermented). I don't want to do fermented 24/7. They love love love it, but fermenting is time consuming. I don't like feeding layer because I have a tiny bantam rooster who really doesn't need any kidney problems. And I prefer feeding organic because I like to sell eggs at the local farmer's market, which requires all organic.
That's a lot...
Now I'm adding ducks. They will be layers, but not at first (obviously). While brooding, I will feed starter with added niacin.
But what about later?
In a perfect world, I'd feed an organic grower pellet that I don't have to ferment. I'd add niacin for the ducks.
Does that exist? I'm only finding organic layer pellet...
My ducks (drakes inclusive!) eat layer pellets from the local Hillbilly-Feed-Mill. They also produce Moonshine, weed and lot's of kids.

No clue if those pellets are organic, vegan or blessed - my ducks like them and that counts.
I bought more expensive pellets and crumbles from the farm-stores and the ducks gave me that »Are you trying to poison us?!« and played hide and poop with the food.
One 50lbs bag costs me $10 and i support a local business and not big corporate.
As for the ducklings, i bought
Manna Pro Ducklings Starter for them and they grew up fine into feisty duckies.
The second ducklings were raised by their momma Katharina duck, they got extra meal-worms and ground up cat-food and ate the layer-pellets from day one on, as they saw their mom eating. They grew up just fine into feisty duckies.
The third ducklings were raised by their Momma Pinball and ate a gazillion of little flies from day one on. They also got some extra meal-worms and cat-food and grew up into feisty ducks by eating the layer-pellets.
Finally last year's fall ducklings got ground layer-pellets with cat-food and extra meal-worms and were switched to a diet of layer-pellets only when they were just four weeks old. They turned into thirteen feisty compost pirates.
Point is: All ducklings, except the first ones had plenty of access to the outdoors and with an abundant supply of insects and plants, naturally growing around here.
You can make yourself crazy about what to feed your ducklings or just feed them the same stuff that you feed to the grown-ups. Add a little more protein (cat-food, meal-worms) and they will grow up just fine.
For the grown up ducks, if they have room to roam around, they will give a quack on your pellets during the summer and eat outside whatever they can get their bills on. Ducks are somewhat not critical when it comes to eating. They eat
everything!
Organic? - Imho (!) the biggest scam in the food world! There is no clear definition of what
organic means, just a broad and vague set of recommendations…
https://en.wikipedia.org/wiki/Organic_food