Pomba Gira, from what I know about her, is not related to any of the common Ezili (Erzulies) like Dantor or Freda. Dantor will cut your heart out if you approach her wrong and she is not sexual in that aspect. Freda is more concerned about "nice things" than erotic affairs. Also, neither of these Ezilis get along. You would never place Dantor next to Freda and when they call them down, they are called down separately because they would fight each other. So it's safe to say that Freda and Dantor may be sisters, but they are not on friendly terms. If a person marries Freda, he must also marry Dantor and vice versa because the one is jealous of the other.
Here are some of the commonly made correspondences between the Orisa and the Nkisi.
Lucero/Nkuyu - Eshu/Eleggua - Legba
Siete Rayos - Shango - Ogou St. Jacques
Zarabanda - Ogun - Ogou Feraille
Mama Chola - Oshun - Freda
Mama Kalunga - Yemaya - Lasiren
Centella Ndoki - Oya - Dantor
There are other correspondences, but it is not advised to confused them because, trust me, they are still separate.
Blackbird