I have been looking on several websites that say that these 2 are the same thing. Is that true? It doesn't say Sevin on the can. Also, it only says it works on northern fowl mites. We have 2 kinds of mites on our chickens. Will it work on both? My hen's clutch is due to hatch on the 28th. I am picking up order of DE today and will do that whole thing. Should I do both?