The dph lnb needed for the hopper 3 is exclusive to the 1000.2 dish, either western or eastern arc. At least for now.
This is supposed to change later this year when they introduce a dph42 switch. It will likely include all those who can't get it now due to custom installations and larger dishes.
C/P: From Vivek
Option 2 – available towards the end of this year. We will have a new switch DPH42 – that will support using your existing 1000+ DISH and existing LNB and will also allow you to have more than one Hopper 3. So you will not require a 2nd DISH, will not have to change your current LNB and you can have multiple Hopper3’s. Since this part is still under development, I do not have a more specific date than Q4-2016 at this time.