Sasukes Rinnegan is actually a result of kabuto sage chakra + near death experience , narutos power up was a result of having a piece of all the bijou within him. Sage only gave them the seals which gave naruto life restoring powers and sasuke the ability to switch places
https://store.nintendo.com/ng3/browse/subcategory.jsp?categoryId=cat50004
Straight from the nintendo store and they give you a 1 year warranty can't go wrong