>>10647154I don't remember offhand why Isis has repeated parts but she does. Sometimes it's the same piece in different material, other times it's some quirk of how the sprue was laid out and they want to re-use something from another kit (Sophia and Rania both have those same pieces, as Anon implied).
It's become a bit of a concern with both Bandai and Kotobukiya because they've released a bunch of stuff in the last few years that wastes an unconscionable amount of plastic. Like one kit had 2 big runners with 80% of the plastic just being wasted rather than making a new runner to include those 2 or 3 pieces.