Sehwa Jung

Thank you for the answer. Yes, I saw the example, and I understand that I need to de-embedding on both wave ports.
For example, if my physical model is 3 centimeters.
and I design 5mm and de-embed on both sides, -12.5mm each.
is not quite the same as if I designed a 10mm and de-embedded -10mm on each side. But shouldn't they be exactly the same in theory? Or is it normal to expect a slight gap?