Improving structures involves comparing old and new designs on a key parameter. Calculating the percent change in performance is a method to assess. This paper proposes a cost-effective analogy by generating replicas of additive manufactured aluminum alloy （AlSi10Mg） body-centered cubic lattice （BCC） based turbine blade （T106C） with the same in poly-lactic acid （PLA） material and their comparison in the context of percent change for natural frequencies. Initially， a cavity is created inside the turbine blade （hollow blade）. Natural frequencies are obtained experimentally and numerically by incorporating BCC at 50% and 80% of the cavity length into the hollow blade for both materials. The cost of manufacturing the metal blades is 90% more than that of the PLA blades. The two material blade designs show a similar percentage variation， as the first-order mode enhancs more than 5% and the second-order mode more than 4%. To observe the behavior in another material， both blades are analyzed numerically with a nickel-based U-500 material， and the same result is achieved， describing that percent change between designs can be verified using the PLA material.