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.