Read the ingredients list of both the new and old feeds. Ingredients are MUCH more improtant to the quality of the feed than whether it is organic or not. Also be sure to pay attention to nutrition percentages. Too little or too much protein, and also calcium (not to mention all the other ingredients) can affect laying and health. Just to throw in a wrench, even if the feed contains a good level of a particular type of nutrition, that does not ensure that it is readily bio-available to the animal.
Also, when an animal is always fed one food, changes can be disconcerting; that is why the general recomendation is to mix both old and new feed together, gradually over a week or two replacing the amount of old feed with new. So say start with 75% of the old brand, 25% of the new; a few days later make it 50/50 and then 25/75. If the animals have always had a varied diet, then they are not usually as sensitive to changes.