There several major differences between the Opel & the Holden. You mention the engines, but they also used Holden transmissions & rear axles. The Holden Commodore front structure was upgraded substantially due to failures in early testing. Also the Holden uses Australian designed rack & pinion steering, whereas the Opel still had a recirculating ball box & draglink etc.
I'm not sure what you mean by "European electrics" but by the time VK was built, most of the German stuff was long gone. Even the entire heater/demister/air-cond system was totally Aussie.
Dr Terry.
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