I've seen GM cars badged as Opel in germany,Vauxhall in England ,Holden in Australia,Isuzu in Thailand all the same car.
GM is owner or part owner or partners with all those companies.
The Holden "Commadore" was the Opel Kommander and a Vauxhall[can't remember the name] too?The Opel "Kadett"in germany was a Holden "Gemini" in Australia