Yes, and Dish can move channels around to different sats on the presumption that you have been "properly" installed to see all the necessary satellites. This way they can move things around and you will always get all of your services. 'Tis much better to have more than less birds you can see.
Actually in most cases you only need 3 sats. Your market (and a couple others in Northern NY) are the exception. The only ones who need 4 sats are International customers who are on Eastern Arc. Then they need 61.5/72/77 and a wing dish for 118.7