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No, same stuff. And the size of the grit is pretty uniform, and it's made for pigeons.

I feed my homers a mix of redstone grit and seaweed grit (which is mostly sea shells and other calcium and iodine minerals). In the past, my birds seemed to prefer the seaweed grit--they'd pick the seaweed grit out and leave the redstone grit for last or not even use the redstone grit at all...