AYU+PEKO???? Who is copying who?

[kanyada]

I 've just noticed their dancing in some performances.
Ayu and Peko danced exactly the same as other. For example, in the ending part of is this LOVE?@a'nation '05, they did the same move of arm and body, and many more that I just can't remember.
Can anyone tell me that who is copying who, or it is because peko teachs her how to move in each performance or else?
Thanks in Advance.

P.S. Even they did exactly the same thing, but Ayu's looks but more better than her. I mean beautiful.Maybe it's because of physical difference