違い difference

What's the difference?

What’s the difference between A and B.

What's the difference between them.

How difference are A and B.

How is it difference from the previous system. 

previous ﾌﾟｩリ ｳﾞｨ ｱｽ adj)以前の･前の

The US is a huge country. So how difference East and West coast simply/in brief? 

違い（区別がつかない・区別していない）

I don't make a distinction between a kindergarten and a nursery school.保育園と幼稚園の違いがよくわからないな。　I personally think both are the same.　個人的には一緒だと思うよ。


Toyota and Nissan
I can make a distinction between BMW and VW. But I can't between Toyoda and Nissan.


express trains  and limited express
a driver's license and a international driver's license

ちょうど

I was just about to say that. ちょうど今、言おうとしていたところです