They pretty much are. Look at the labels. They're all using the same ingredients that come from the same chemical factories. There is nothing special about Athena. It's just overpriced compared to many other similar products made with the exact same ingredients.
There is absolutely no reason to pay what they charge for a mixture of cheap chemical salts.
Bloom A:
Calcium Ammonium Nitrate, Potassium Nitrate, Iron EDTA, Iron EDDHA, Zinc EDTA, Manganese EDTA, Sodium Molybdate, Sodium Borate, Magnesium Nitrate