The guy at the feed store said it would be fine to start the chicks on grower feed. Our chicks will be layers. The food is a mash I beleive not pellets. I bought a bag today. Our chicks are on their way, may have them by tomorrow!
I get a custom mixed feed, but the gal I get it from said they start all their chicks on their "meatbuilder" ration (basically a grower feed) then at 3 months, they switch the layers to a "lay" ration!
I think the grower or meat builder rations usually have a higher protein content which the chicks need for growing.
Around here, the stores sell a single formula, different brands, called "starter/grower." You could research it, see how the feed's ingredients stack up to starter -- or just use it.