No, Jean Grey and Scarlet Witch are two distinct characters in the Marvel Universe.
The Scarlet Witch, an alter ego of Wanda Django Maximoff, was first introduced as a reluctant supervillain alongside her twin brother, Quicksilver, both founding members of the Brotherhood of Evil Mutants.
Jean first experienced a transformation into Phoenix in the X-Men storyline "The Dark Phoenix Saga". Due to Mastermind's manipulations, Jean's psyche was twisted and she became Dark Phoenix during "The Dark Phoenix Saga", before sacrificing herself to prevent any further chaos.
Phoenix (both Dark and Force) have the ability to rearrange their molecular structure, and fly at hypersonic speeds—a power that Wanda does not possess, however Wanda has the ability to not only manipulate, but create reality (House of M).
They've met many times. They've fought. They've teamed up, in a two-teams-working-together kind of way. They know some of the same people. But Wanda has never been an X-Man and Jean has never been an Avenger, so, in terms of really knowing each other, there's not much there.
we know that its called that Scarlet Witch and quicksilver are not magneto's children. but Magneto still sees them as children and Polaris sees them as sister and brother.
They control the reality! Stalemate. Honestly. Both of them have complete mastery over their abilities and although the Phoenix Force beats Chaos(marginally) as primordial concepts, Wanda and Jean are powerful vessels and have basically can direct their abilities.
Scarlet Witch was by far the most powerful MCU Phase 4 character, yet Wanda could not beat Thanos in either Avengers: Infinity War or Avengers: Endgame.
Scarlet Witch is no longer considered a mutant, but in the Age of X-Man (an alternate plane created by X-Man where everyone is a mutant), she is remembered as one.
Upon the return of Apocalypse, Gambit submitted himself to the villain and was transformed into one of Apocalypse's Horsemen, Death.
After taking Wolverine back to Earth, Jean and the rest of the X-Men confronted Xorn in NEW X-MEN (2001) #150 by Morrison and Jimenez. In Xorn's final moments, he attacked Jean with a lethal electromagnetic pulse. Even with the Phoenix's power, this was too much for Jean, who succumbed to her injuries in Cyclops' arms.
Darwin possesses the mutant ability of reactive evolution, which allows him to continuously transform his body to adapt to danger. Darwin as depicted in Uncanny X-Men #478 (November 2006).
Kamala discovers that she possesses a dormant X-Gene, making her a mutant/Inhuman hybrid. Charles Xavier plans to have Kamala announce her dual heritage to the general public at the Hellfire Gala to improve mutant and human relations, but is prevented from doing so when Orchis forces attack the Gala.
THE BIRTH OF BILLY AND TOMMY
While Wanda was married to the Vision, she used her reality-altering hex powers and magic to become pregnant with the twins. During that mystical process, Wanda created the twins using parts of souls that belonged to Mephisto.
🍿: The first on-screen F-bomb in the Marvel Cinematic Universe landed in Guardians of the Galaxy Vol. 3, when Star-Lord finally snaps and drops the word during an emotionally charged moment.
The Mark 42 (or XLII) Iron Man armor is special because it's an autonomous, modular suit that can assemble itself around Tony Stark, controlled by microchips in his arms, allowing remote operation and deployment in separate pieces, making it his first "summonable" armor but also prone to malfunctions as a prototype. It's famous for its unique gold-and-red design and the ability to fly in segments to surround Tony, even letting others wear parts of it, though it was still experimental.
Captain America has lifted it, as has Loki. However, one of the more surprising characters to lift Mjolnir was Deadpool - but unlike some of the others to wield the hammer, the moment wasn't as it initially appeared."
The source of Wanda's unnatural abilities stem from a two-fold base; unparalleled mastery of actual magic and an innate power to warp reality. Due to exposure to mystic energies and forces at an early age, Wanda may reshape reality to various extremes.
Not just sacrificing Vision.......she single handedly destroyed an infinity stone without using the others in the gauntlet like Thanos did.
Eventually through their battle, it would come to pass that Wonder Woman would eventually fall to submission as Captain Marvel would best her and even outlast her due to her several key traits. The third heroine who could fight Wonder Woman on equal ground and ultimately defeat her is in the Marvel Universe - Gamora.
Debuted under the name Marvel Girl, Jean Grey is one of the first X-Men. She wields omega-level mutant powers like telekinesis, which lets her move things with her mind, and telepathy, which lets her read thoughts.
As the name might suggest, none surpass The One-Above-All in power. The One-Above-All is essentially the creator of the universe, a being so powerful, so limitless, that nothing even comes close to matching its power level.
Jean grey is the physical manifestation of the phoenix force. She can be defeated but never permanently.