一丘之貉的英文：
[Literal Meaning]
one/mound/aux./raccoon dog
raccoon dogs from the same mound

[解释]
都一样，没有什么差别。

[Explanation]
evil persons of the same type

[例子]
他们两个在战争期间都当过敌人的翻译，是叛徒，一丘之貉。

[Example]
They both served as the enemy's translators and became traitors. They were of the same species.

[英文等价词]
to be cut out of the same cloth
birds of a feather
jackals of the same lair
things of the like description

Prejudice and contempt, cloaked in the pretense of religious or political conviction are no different
带着宗教或政治面具的偏见和轻蔑也都是一丘之貉。

I'm not surprised those two are such friends; they're birds of a feather.
"那两个人交情这么好我不惊讶,他们是一丘之貉嘛"