If you mean the resemblance between the two films, with the earlier Niagara providing inspiration for the later Vertigo, you may have something. At least, jseangallagher notes that Hitchcock may have been inspired by this.
Anyway, it would not be the first time Hitchcock had liked something in another film and worked it into one of his own. Directors, including the great ones, do that as much as composers. The famous shower scene in Psycho (1960) bears a strong resemblance to one in The Seventh Victim (1943). The earlier scene has a different outcome, but it achieves an extreme sense of vulnerability and suspense that would not have been lost on Hitchcock.
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