Constitutional Question of the Day

(Full disclosure: I probably won't be able to do this everyday.)

Articles of Confederation, Article II. Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assembled.

Constitution, Amendment X: The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

Are these significantly different? If so, why?