Why do Lego Phantom Ninja 7 1765 have two more parts?

Generally, there will be more parts in Lego boxes, but they are generally limited. The big building blocks are just right, and only small parts will be more. Every Lego will be equipped with more parts. Some parts are relatively small, and children are easy to lose when playing, so they will be equipped with more spare parts, so that's good! Accumulated parts can also diy a model, not bad!