The connectors can be different. OBD (On Board Diagnostics)
only specifies some of the pins on the diagnostic connector, anyway so others could be different. But the connectors also have some coding resistors inside that tell the T4
which one is plugged in. So even if wired to the car identically, the coding resistors are different. I know there are red, yellow, blue, grey and black plugs for different jobs. There may be others, but I don't have those so can't be sure. 75/ZT is red.