Yes, and it's easy to get lost in all the techno-babble, especially if some of the lingo doesn't make sense.
So, it's always good to ask a few questions when yer confused.
We have straight answers,
- we have recent threads,
- and for some more complicated matters we have FAQs.
Doesn't mean they always address a problem the way you need.
So, if what you want, is a way to get two receivers connected to a whole bunch of LNBs, here are three to consider:
1 - loop-out of one receiver into a second
2 - dual-output LNBs can be connected to switches, and fed to 2, 4, 8, even 16 or more receivers
3 - bandstacked LNBs which put out both V and H polarities at once, and can be fed to multiple receivers.
Only the first answer above, would apply if you insist on using the BSC-621 dual band LNBf.
If you have a particular goal in mind, maybe we can come up with a solution.
However, often the choices will be a trade-off . . . or aggravating. -

But, the guys here can give you the benefit of all their ideas.! - :up