Here in the UK it seemed quite often 1995MY cars had a G80 (they also have the gold EZK but they're unfortunately equipped with EGR junk) and Wentworth's always have a G80, other cars probably have them in as they were specced like that by the original customer at the dealership. I don't know what it would be like for Australian cats though, but it might be worth seeing if that's the same as over here.
I've got a G80 axle in my garage to go in my 940 and it is true they have a very different style of sticker that says 1041 not 1031. I've just had a hernia operation so I won't be able to go for a few weeks but if there's a Wentworth still in a local scrapyard I was planning to pull it out to sell it on. I could strip the diff out of it (are the half shafts different too?) And post it to Australia. I bet postage would be mega money though.
It's a 94 Wentworth on 228k miles, it had an M90 gearbox so I pulled that out of it and stripped a few goodies including the gauge cluster which luckily had a working speedometer! There's also a 1993 940 B230FK but that's sadly an autotragic otherwise I'd have pulled the solid flywheel out of it.