Yes.
Water bombs can be replaced by steel balls. The water gun is a toy gun that claims to be made of "water" in bullets. It is an electric toy gun that can be fired continuously. It needs to be assembled. Toy gun bullets are not made of water.
The water bomb is a soft toy gun bullet made of soft materials. It is a water compound containing a cross-linked copolymer of sodium polyacrylate. It is used in many toy guns on the market.