tweedledum and tweedledee

twee·dle·dum and twee·dle·dee  (twdl-dm n twdl-d)

n.

Two people or two groups resembling each other so closely that they are practically indistinguishable.

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[After Tweedledum and Tweedledee, names of two proverbial rival fiddlers, of imitative origin.]

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Tweedledum and Tweedledee [ˌtwiːd^əlˈdʌm ˌtwiːd^əlˈdiː]

n

any two persons or things that differ only slightly from each other; two of a kind

[from the proverbial names of George Frederick Handel (1685-1759), German composer, and the musician Buononcini, who were supported by rival factions though it was thought by some that there was nothing to choose between them. The names were popularized by Lewis Carroll's use of them in Through the Looking Glass (1872)]

Thesaurus

Noun

1.

Tweedledum and Tweedledee - any two people who are hard to tell apart Tweedledee and Tweedledum pair, brace - a set of two similar things considered as a unit