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Zatanna - Scarlet Witch

A no-brainer, despite differences cited below…

Both are also key to big, controversial storylines that shook up the status quo of their respective teams and the fictional diasporas in which they reside.

Commonalities:
Both are mystically inclined: the Scarlet Witch was shown to have had training in sorcery…BUT…

Differences:
Wanda’s innate ability lies in her mutant-borne hexes, which wreak havoc on probabilities; she is the archetypal “strike a pose and point” superheroine described in the post below. And Zatanna is not the daughter of a super-villain, nor the sister of a fellow hero, nor the wife of an android. And Wanda doesn't speak her spells "drawkcab."

Alternate histories:

ZA: A girl and her brother (to be named later) are raised by John Zatara; she’s named Zatanna. After she discovers an innate ability to control elements, the siblings are drafted into the employ of an international terrorist, but are soon reformed and join Green Arrow in a Batman-led second iteration of the Justice League of America. She serves with the organization for years, and enters into a controversial romance and then marriage with android Red Tornado. After learning that the aforesaid terrorist is Zatanna’s father, the two evidently have children (which turn out to be magical constructs); soon, she becomes estranged from Red Tornado, who is reassembled as an emotionless mechanism. After a short romance with Captain Atom, Zatanna reconciles with the Tornado. She loses her mind in recent years and enacts both the destruction of the League and, briefly, a wholesale reordering of reality. She is now apparently living a quiet life, unaware of the events of her life.

SW: Wanda Maximoff is born to two sorcerors, Django Maximoff and Magda; As a young woman, she learns of and cultivates her congenital mystical abilities. After her command of magic matures, she takes the codename the Scarlet Witch and joins the Avengers. During her time with the organization, she enacts a controversial “mind-wipe” of an opponent.