They're not the same characters, they're completely different characters. Did you watch the movie with the sound off?

https://en.m.wikipedia.org/wiki/Tik-Tok_(Oz)

https://en.m.wikipedia.org/wiki/Jack_Pumpkinhead

Edit: Its been a while since I've watched the movie, forgot the original characters do show up. Their designs are closer to the original illustrations in the books.