It is a horse of another color. We cannot mention them in the same breath.

这是风马牛不相及的事，我们不能把它们相提并论。

youdao

And a rider whose horse failed to win of course lost to a horse of another color.

如果骑士的马未能获胜，骑士当然就输给了另一种颜色的马。

youdao

Today, when you say, "That's a horse of another color, " you mean that an entirely new situation has arisen and you must consider the change before making a decision.

现在，当你说：“那是一匹另色马”，你的意思是：完全不同的形势出现了，你得考虑出现的变化，再作出决定。

youdao