What Difference does 'Being in Someone's Astro-Twin Cohort' Make?

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You know your 'astro-twin cohort'---the group of people born on the same day of the (same-or-different) year, under the same sign ... e.g. I'm in the July 9th astro-twin cohort, along with Tom Hanks, Brian Dennehy, Lindsey Graham, O.J. Simpson, Bon Scott, Jack White, Fred Savage, Courtney Love, Phineas Gage, Jimmy Smits, Dean Koontz, John Tesh, Linda Park (Hoshi Sato from ENTERPRISE), a few more (Bing recognizes them, I don't) and many more. https://www.bing.com/search?PC=U523&q=famous+people+born+july+9&pglt=299&FORM=ANSPA1&DAF0=1 What added influence does astrology have (although the medical dictionary defines 'birth cohort' as the group of people born around the same exact time, so maybe I make it "astro-twins")? Is someone more-likely to find success if they were born 'on the same day of the year' (more-or-less 'exactly in the same astrology') as some other successful person? more likely to make the same kinds of mistakes they make?