LNB questions

I have a Telefuken labelled as a "twin LNB for one satellite and two receivers".
I would like to know if the two outputs are independent, ie if one can receive 10.7GHz and the other 12.75GHz

What about the noise figure, some claim 0.2dB, others 0.1dB, are these numbers only advertisements ?

I would like to understand noise and gain numbers :
Can a little dish with a high gain lnb and low noise figure be equivalent to a bigger dish using a lower gain and worse noise figure lnb ?

thanks