If Frigg and Frija are one in the same, then Allmother is equal to all Earth Mothers. This would equate her to Gaia, the Earth Goddess from the Greek pantheon.
Frigg lost a child and descended into Helheim to see him again. She shares this grief with Demeter, who lost her daughter Persephone to the Underworld.
As a mother figure, she could also have similarities with Danu, from Celtic traditions, though Danu is the mother of all Celtic deities, not just the mother/queen figure. Frigg, in contrast, has a clear genealogical line of who her children and step-children are.
Neith is an Egyptian goddess of fate. She sits weaves the threads of life. Similarly, Frigg, sitting at a spinning wheel, weaves destinies of gods and man.