Is there a difference among the three gardasil shots?

No: All three doses of Gardasil are the same Gardasil, protects against four HPV types (6, 11, 16, and 18), is approved for use by females aged 9-26 to help prevent cancer of the cervix, vagina, and vulva; genital warts, and anal cancer. It's also approved for males aged 9-26 to help prevent genital warts and anal cancer. A second type is Cervarix which Cervarix targets HPV types 16 and 18

You mean HPV?: There are 3 HPV vaccines now available.Cervarix covers the main 2 strains associated with forms of cancer, Gardisil 4 covers those strains plus 2 associated with genital warts.Gardisil 9, the newest adds 5 additional less common strains that are associated with cancer.All HPV vaccines have value and the choice of which one should be be between doc and patient.