What is the meaning(s) of "Tweedledum and Tweedledee"?

Tweedledum and Tweedledee are fictional characters in an English language nursery rhyme and in Lewis Carroll's Through the Looking-Glass, and What Alice Found There. Their names may have originally come from an epigram written by poet John Byrom. The nursery rhyme has a Roud Folk Song Index number of 19800. The names have since become synonymous in western popular culture slang for any two people who look and act in identical ways, generally in a derogatory sense.

Tweedledum Tweedledee

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What is the meaning(s) of "Tweedledum and Tweedledee"?

For example a sentence say : Will it be Tweedledum and Tweedledee on human trafficker law?

For me "Tweedledum and Tweedledee" give sense of childish or so. But what is the real meanings of these two words.

"Tweedledum and Tweedledee" are the names of two fat identical twins in Lewis Carroll's 1871 novel "Alice Through The Looking Glass".

Figuratively speaking, the names are used to describe two people or institutions who act or think identically, even if one would realistically expect them to have different opinions. It's a dismissive and derogatory term.