Extremely similar; like twins.
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Two people who are very alike in personality, habits, or interests.
When you call two people two peas in a pod, they think alike and are nearly always together.
It's usually said warmly about close friends, siblings, or partners.
"Birds of a Feather"
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People with similar interests who naturally gather together
"Cut from the Same Cloth"
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People who share the same background or upbringing
"Two Peas in a Pod"
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Two specific people who are remarkably alike in personality and behavior