Yom Kippur candle lighting has unique blessing
להדליק נר של יום הכפורים
Technically, we could argue that since Yom Tov is called "Shabbat" (see Leviticus 23 as an example), we should have just one blessing להדליק נר של שבת . I'm assuming that they instituted a separate blessing for Yom Tov, because one may light a fire from another fire on Yom Tov - something that you cannot do on Shabbat.
But Yom Kippur is much like Shabbat anyway, as one cannot do work or light a fire, just as on Shabbat. Why not use the Shabbat blessing for Yom Kippur?