Japanese and european feudalism were similar in what ways

The main difference was that in Europe, we had the system where food was given to the church, peple did not have the same manners as paeasants in Japan did; they did not bathe as often as Japanese farmers. Furthermore, while in Europe farmers were the lowest social class, this was not necessarily true of Japan. Another difference was in the produced food - the Japanese mostly produced rice, while European citizens produced different kinds of agricultural produce. 

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.