Is a karate plastic board harder than a wood board?

The plastic material that it is made from is harder than wood. However, the breaking point of the joint in the plastic is designed to match the force required to break various thicknesses of wood. They should require the same force to break regardless of whether it is wood or plastic. Consult the manufacturer's specifications to match the appropriate colored plastic board with the size of wooden board, as they may not be the same.