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I thought “two of a kind” meant that they were the same. Like you and your friend are two of a kind, liking the same things, having similar personalities, etc.
Yes, and such pairings occur frequently.
The saying “two of a kind” is saying that the pairings are uncommon enough to stand out.
‘Two of a kind’ means a pair that are just alike. It does not speak to the commonality of the item or persons.