Technically, though, if the two masters are contributing their "acting skills" by taking active parts in participating in the skit (not costume craftsmanship for the skit, since that's not required to be judged), wouldn't they have to compete as masters? I've 98% of the time seen it stated in the rules that you go by your highest skilled member in the group.
Alibaba - Magi: The Labyrinth of Magic
H/A Elsa - Frozen
Yunan - Magi: The Labyrinth of Magic
Mephisto Pheles - Ao No Exorcist