Thanks, and that is interesting. Google Translate serves its purpose well.

Is there a Japanese Wikipedia? Any thoughts on where that "new" N42 casting comes/came from?

There is a disconnect between ATK Vege (which seems to be a combined company, looking at the logos and the descriptions) and the KSS that comes up through that Japanese ATK link. 1936 versus 2003. North America versus Japan.

From the web pages -

https://atkvege.com/about-atkvege/

About ATKVege

ATK North America is the largest private label Crate Engine Remanufacturer in North America. Partnered with our sister company, VEGE de Mexico, ATK VEGE has a history of Remanufacturing that dates back to 1936.

https://atk.co.jp/company/