SS package Your State

Looking to purchase the age 9-11 SS package Your State but there are 2 options....what is the difference between SS Package Your State #1013 and SS Unit Your State #450?

These two are actually exactly the same. Generally, the package will come with the literature and supplies needed for the unit and the unit is just the curriculum book. In this case, there is no book or manipulative. That is why the price is the same.