I see different layout of those two engines, but I don't have idea which engine was (if it is at all) used as prototype. In some manner, looks like "Yami" XS 400 layout, but...

I was wondering, why nobody among dozens of Chinese bike manufacturers didn't stuck in their bike some knockoff of "Briggs & Stratton" V2 "Vanguard" or "Honda's" GX 630/660/690 engine and make us all happy. Imagine: we'll be having bunch of "Guzzi-ish" bikes.