Using analogLib port as a differential input instead of balu

[Arik Zafrany]

Hi,

Is there equaivalent model for the analogLib port for differential
circuits?
is the R splitted between the negative and positive terminals and the
voltage source is divided by two?

I see sometimes that people simulate a differential block (say LNA)
with port of 100 [ohm].
Is that mean that this is another way to simulate differential circuit
instead of port+balun? is there any difference?

Regards,