I have never been to Japan so 100% open to posters correcting me/adding things! But the other day I was thinking it's funny, the two seem to actually have a lot in common
Driving on the left
Love of tea and codified ceremonies/rituals around tea
Island nations
Big former empires
Hardcore monarchies
A strange contrast between a tightly buttoned aspect on one hand, and then eccentricity and subcultures on the other
Big importance placed on social niceties and possibly repression
Love of whiskey and whiskey making culture
Feeling separate to the rest of their continent (is this true for Japan?)
Very densely populated
Important in developing trains (steam, bullet)
Love of fancy dress/costume