Zelda blinked, giving her head a bit of a shake. "Oh! Yes. They'd have to be matching, anomalies would stand out. Someone out there comes in here, they'll see a difference. If the inside's decorative, it's a weakness, if it's bolstered, then why? Why isn't the outside likewise strong? One doesn't notice the things which are the same, but the glitches, the anomalies, the offhand quirks, those stand out. Biological evolution wasn't my strong point as much as technology, but there's a reason that packs tended to chase off animals that stood out. They'd have to match, just based off science alone."