you can use the key for either one, but you cant use the other cd for another computer using the same key.
semp
( depending on what type of "DVD" you purchased 1 copy - personal, 3 copy - family or small business, corporate copy 5+ - whatever reason but you get more licenses/keys for however many versions you have ordered/paid for )
not much difference if any at all between the DVD's.......... just number of cd/DVD keys you purchase.......
TC