argh i think it's just clicked. The Wiring is not specific to the unit, but the car.

SO all TCU units need the pins in the same configuration, and it need to swap the wires in my car about to match the configuration required by the TCU

So my car currently has
Telephone (BM On-Board monitor with Fixed mounting, Siemens (cordless handset) with SES Language-input system up to 2002_3)


And I want to fit a TCU unit so i need to swap the wiring to match the following:
Telematcis control unit (TCU-Everest) (SES Language-input system with TCU Telematic Control Unit without USA_LHD)

Which TCU i get doesn't matter, as long as i have rewired my connect for a TCU moduel correct?