Both are needed but they are different.

二者都是需要的，但它们是不同的。

They are different in size but not in kind.

它们大小不一,但性质相同.

RM: Yes, but they are different fundamentally.

是的，不过他们的本质有些不同。

They are different in the form of word building.

各民族语言有各自的特点,在构词形式等方面是不尽相同的.

Both bond and stock are securities, but they are different.

债券与股票都是证券, 但两者有区别.

They are different in some ways but similar in others.

它们在一些方面有不同之处，但是其他方面却是相似的。

Tax official: they are different in tax rate and deduction.

税务局: 税率和扣除额不一样.

Now they are different sentences you mustn't complaint them.

现在是不同的句子,你不能解释。

The demands of our time are great and they are different.

我们肩负伟大使命，他们与众不同。

They are different then me, and not as experienced as me.

他们是不同的个体，并且没我这么经历丰富。