AD9680 input impedance matching questions

good day

I have several questions regarding the input interface of the AD9680.

I would like to design a matching network using Snp file. Firstly I don't understand why S2p are provided whereas I expect only file having S11 parameter since the purpose is to provide matching impedance. In addition several files are provided, I don't know which one to use. Could you please clarify which context for each file?

In the datasheet page 36 at table 9 parameter values are provided for the components shown in figure 115, I was wondering if these values are still ok whatever differential input impedance value is set (see figure 116 where different resistors can be selected via registers). Is it possible to attach a drawing of an example of matching specifying the context ( frequency range...)

Thank you in advance for your reply

Best regards