我们两个长得很不一样 （突出 长得 这两个字 不是性格不一样）
We two are quite different in looks.
or
We two look quite different.
但是我们在性格方面相同
But we are the same in character/personality.
我们像一面镜子,虽然长得不同但性格相同
We are like a mirrior,different in looks but the same in character/personality.
祝你开心如意!