what part do you mean? southern asia? despite what some travel guides constantly wanna make me believe, from what i gather i find asian countries in that region very homogenous. indonesia, malaysia, thailand etc., to me these nations have lots of similarities - unlike norway and calabria, belarus and switzerland or greece and denmark.
Perhaps we should ask a Bangladeshi whether he thinks there are many differences between Norway and Calabria, Belarus and Switzerland or Greece and Denmark. I very much doubt he would. I have no reason to think the same doesn't happen the other way around.
I was referring more to the region ranging from Bhaktapur to Pyongyang, with an area comparable to that of Europe and with such diverse countries as Nepal, India, Bangladesh, Laos, Cambodia, Vietnam, Thailand, Malaysia, Indonesia, Singapore, Taiwan, China, Japan, South Korea, North Korea, etc.
To take the points that you mentioned, those countries are much more heterogeneous in economies, attitudes, history, politics, habits, etc. than the countries of Europe.