There is no difference at all.

毫无差别。

There is no difference between the two in quantitative terms.

两者在数量上毫无差别。

There is no difference between the two.

两者之间没有任何分别。

There is no difference between us.

没有我们之间的区别。

There is no difference in their views.

双方的意见并没什么不同。