tweedledum and tweedledee
- two persons or things so much alike as to be almost indistinguishable
- two almost identical brothers in Through the Looking Glass, by Lewis Carroll
See tweedledum and tweedledee in American Heritage Dictionary 4
(twēdˌl-dŭmˈ ən twēdˌl-dēˈ)
noun Two people or two groups resembling each other so closely that they are practically indistinguishable.
Learn more about tweedledum and tweedledee