This is definitely inappropriate. The two clients are in a competitive relationship. Even if the markets are not in the same place, they would not want to see competitors' information appear on their product packaging. In addition, there are legal issues in doing so. The client can only use its own relevant brand information and cannot use the information of another client. The presence of other company's information on the product may constitute infringement, and if the quantity is large, it may be punishable by prison.