She's supposedly two different girls, almost a decade apart...
...even though both of them have the same boyfriend!
When this story from Tower's Tippy Teen #3 (1966) was reprinted in Atlas/Seaboard's Vicki #1 (1975), more than just the fashions and hairstyles were altered*.
Tippi became "Vicki", though her boyfriend remained "Tommy Trippit" in both versions!
Why did Seaboard change the character's name from Tippy to Vicki?
But, since Vicki was cancelled after only four issues, the question is now moot.
*With sales falling on most non-superhero genres in the late 1960s (including Western and war as well as romance and teen humor [except for the Archie titles]), "updated reprinting" became a common practice on teen humor and romance comics until the genres all-but died out in the late 1970s.
Editors felt that:
a) the plots were relatively timeless.
b) updating the art was cheaper than totally-redrawing the story.
c) the artists were better-utilized doing stuff that sold better (like superheroes).d) the audience for teen humor and romance comics, unlike superhero comics, totally-changed every 5-6 years anyway, and wouldn't notice the "old" plots.