Tweedledee And Tweedledum (Noun)

Any two people who are hard to tell apart.

Nouns denoting groupings of people or objects.

The two cousins were such Tweedledee and Tweedledum that I couldn't distinguish them from one another at the family reunion.
Politicians often appear as Tweedledee and Tweedledum, offering little choice to voters due to their similarities.
In a group photo, my sister and her twin friend were like Tweedledee and Tweedledum, identical in their expressions and clothing.
When casting identical twins for the film, the director intentionally looked for actors who seemed like Tweedledee and Tweedledum to add to the storyline's effect.
The comedic duo's style relied heavily on their image as Tweedledee and Tweedledum, dressing and acting alike on stage.