Works as long as they are clean.
What is the tolerance on the gap you are working with? Compare that to the error of putting two feeler gauges together - check with a micrometer or vernier preferably a good one.
Probably, but not for certain.
Manufacturers build cars in many countries, and sometimes or often source parts and assemblies from other countries. Without knowing what specific parts and assemblies and other products join to feed a particular assembly line, the question cannot be answered.
But because Honda and Toyotas are generally designed in Japan, it'...