The Rings were all equally made for being used by Elves, but they were different from the beginning. In the unfinshed tales we can read about the fall of Eregion and when Sauron captured Celbrimbor in the house uf the Gwaith i Mirdain, Celebrimbor revealed easilie were the nine were stored and under torture he gave away the hidding places of the seven, but about the three he said nothing. That does mean that Rings were already grouped in the same numbers before Sauron toke them.
Respectfully
Findegil
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