"Instead, Holden manufactured their own 3.8 litre V6 engine based on a Buick design, adapted from front- to rear-wheel drive."
"The latest revision of the Buick 3.8 litre V6 engine was fitted to the VR Commodore, featuring rolling-element bearings in the valve rocker arms and increased compression ratios"
Holden Commodore - Wikipedia, the free encyclopedia
And so on, even a supercharged version of the V6 around the same years that GM used it on the 3800 in the US, along with similar power ratings.
Sho' Nuff, just who ever wrote the 3800 info didn't put the Commodore in, or didn't consider it to be the 3800 due to the holden changes.