All series 1 & 2 wagons that came from the factory with the 4 speed manual used the H190 diff.
All series 1 & 2 wagons that came with the 5 speed or auto came with the H165 diff
All series 1 & 2 sedans used the H165 diff
All series 3 cars used the H190 diff.

The series 1 & 2 four speed models, sedan & wagon, came with a one piece driveshaft I believe while the cars that came with the five speed or auto came with a two piece driveshaft, so if a one piece driveshaft was salvaged from a series 1 or 2 wagon, then we can assume it is for the H190 diff & if the driveshaft is for the H165 diff then it will be half of a two piece unit which can not be used as-is.

I do not know what arrangement was used in any of the series 3 cars.