Range Rover Classis ABS Pump Pressure Switch

Hi folks, the rangey has failed on the old ABS light on thing, all wheel sensors fine, pumps all fine and running to pressure and in specified time.
2-3 Blink code and the system checked out apart from the sensor, this is the unit with the accumulator seperate from the pump and switch and well it is impossible to get!!
The P38 unit is a combo and has a green switch (mine is silver) that looks similar but my mechanic reckons it is different, plus mine has 5 terminals in a row the green has a 2-3 stacked setup.
Online I have seen pumps similar to mine with the green switch fitted, are they compatible and it is just the wiring that will need changed???
Cannot get a pump or switch the same as mine at all, so stuck car less!
Soft Dash model btw

Any play in the wheel bearings as this will cause a fault, even a little play can set it off.
Make sure sensors are all pushed down or in properly.

Not my 1st Classic, all readings etc checked it is a dead abs pump pressure switch for sure, hence the question of compatibility with 'green' switch on P38 pump.