They mean different things. Send him to the bank=force him to go to the bank Send (the chocolates) to him= deliver the chocolates to him

"him" can be a direct object or an indirect object. Send the package. Send the package to him. Send him the package. (package = direct object; him = indirect object) Send Joe to the store for bread and milk. Send him to the store for bread and milk. (him = direct object; store = indirect object)