It's been a few years since I switched to the new LNB. There is only one new one, you just have to ask for it. The other issue I had was that I had the new LNB at home and the old one on our RV, I found that the receiver is specific to the LNB, the receiver at home on the new LNB wouldn't work on the old LNB on the RV. I was in Canada and called Shaw, they changed the software so I could use the receiver on the old LNB, I then got the new LNB when I got home and asked Shaw to do the software change again so that receiver worked on the new LNBs. Hope this helps.
As an add, I'm assuming you are talking about a dish that you aim manually, if you have a pre 2017 Winegard dish on the roof, Shaw's channel shuffle back in September has rendered it obsolete as one of the channels the dish used to find the sat no longer exists due to Shaw. There is a manual aiming procedure and an upgrade kit available.