Differential pair routing - finding net pair

[paulvdh]

@hmk

it seems that it would be helpful, if the differential pair routing tool could be made aware of the information of differential pair that is already present in the TX1+ and TX1- pin names

Do you mean something like these pin helpers?
(Coming in the next KiCad version.)

Post-v7 new features and development news

Pin Helpers: a set of tools to rapidly break out from symbols.