Riri Williams, better known as Ironheart, has always had a connection of some sort in the comics with Tony Stark's Iron Man; however, it doesn't seem as though that connection will play a factor in the Marvel Cinematic Universe. Riri Williams recently made her MCU debut in Black Panther: Wakanda Forever, where she was played by Dominique Thorne. And of course, Tony Stark is long dead at this point in the MCU timeline.
Riri's first suit seen in the film is rather similar to her original Mark 1 suit from the comics, which itself is a reverse-engineered variation on Tony's very first suit. In an effort to help Wakanda in the final battle against the Talokanil, Riri later builds a new suit that's closer in design and color scheme to her Mark 3 armor in the comics. Interestingly enough, the movie seems to skip her Mark 2 armor, whose color scheme in the comics is the same as Tony Stark's classic Iron Man armor.
The comics showcase a gradual change when it comes to Riri's upgrade in armor aesthetic as her journey progresses, one that reflects the relationship she has with Tony Stark. The connection between Tony and Riri doesn't end with her replicating his armor. At one point, she goes as far as to headline Invincible Iron Man as its new (albeit temporary) star. Her Mk. 2 armor is a key component of that relationship, but it's a relationship that some readers digested as Marvel trying to replace Tony Stark, which many didn't take well. Considering the negative attention that Riri Williams received as a character from fans, especially after debuting her Mk. 2 armor, it's understandable why Marvel would skip it in her adaptation.
MCU's Ironheart Has No Connection to Iron Man
Their comic relationship initially blossoms with Tony Stark immediately giving Riri Williams his blessing to be a superhero (and, by extension, to be the next Iron Man) once he catches wind that a young M.I.T. student has single handedly reverse-engineered one of his old suits. Briefly, while Tony Stark is in a coma following the events of Civil War II, she becomes the lead star of his Invincible Iron Man series. Even if the replacement period was brief and made clear to be brief, fans did not take well to the idea of anyone else but Tony Stark being Iron Man. This is despite the fact that it wasn't the first time, as once upon a time ago, his own best friend Rhodey briefly replaced Tony as Iron Man. For a lot of fans, Riri donning the classic red and gold colors that Tony made famous was the last straw. These readers reduced her to being nothing more than a Tony clone, or worse, giving her the much-maligned (and undeserved) Mary Sue label.
Her far more unique Mk. 3 suit was a great start for Riri Williams to start carving out an identity for herself separate from Tony Stark, but for most readers quick to bash her regardless, it was too little too late. Marvel Studios seems to have learned from the reactions of these Marvel Comics fans and decided to skip adapting her Mk. 2 suit altogether, probably for the better. Besides, in the movie, Riri Williams doesn't even mention Tony Stark as her second suit is built to honor Queen Ramonda and Wakanda, not Iron Man. With no connection to the original Iron Man in the MCU, it wouldn't even make sense narratively for Ironheart to try to mimic the build or color design of one of Tony's suits.