Anhydrous AlCl3 will dissolve in diethyl ether because it is a good lewis acid. It is electron deficient. The lone pair of diethyl ether will be dobated to the anhydrous AlCl3 due to which it is soluble. On other the hand, hydrous AlCl3 has the water molecules which make it poor Lewis acid.
So, anhydrous AlCl3 is more soluble in diethyl ether.
