They look like their consorts with similar Vahanas and Ayudhas.
Ayudhas or Vahanas as mentioned in the picture is the way to recognize them individually.
Sometimes Ashtamatrikas are also found in temples – adding Vinayaki or Narasimhi to the Saptamatrikas.
The oldest reference of Saptamatrikas can be available from the seals of Indus valley Civilization.
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