You’re two of a kind. 


A: Hey, don’t eat 10 cookies. They’ll all be gone.
B: You had a lot too, didn’t you?
A: I had only 8.
C: You’re two of a kind.

In this situation, what should you say ‘You’re two of a kind’ in Japanese?

Casual

C:どっちもどっちだな。

Note: This is not a word-for-word translation.


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A word-for-word translation

C: 君きみたちは同おなじタイプだね。

It’s OK and natural, so you can use the expression.

There are some common Japanese phrases.
In this situation where C wants to say that both are not very good, we often say どっちもどっちだな or 似にたり寄よったりだね.
In this case, どっち means ‘either’ in, for example, ‘I can’t choose either’.
似にたり means ‘similar’ and, I think, 寄よったり has no practical meaning here, it just put together to rhyme.

On the other hand, if you want to say they are simply alike, you can use the common Japanese phrase 似にたもの同士どうしだね or そっくりだね.