Product addition in excise registration certificate

Recently my client is manufacturing Fertilizers Name Single super Phosphate in powder form & Granulated form (SSP & GSSP). Now He wants to Manufacture another fertilizer called Zincated single super phosphate & Boronated Single Super Phosphate whether he needs to apply for product addition in Excise Registration or Not? Is there any Penalty for non application of Product Addition in Excise Registration? Kingly Guide me as early as possible. Thanking You..