A bit stumped on these two sisters! Pairing was a Spinnerblast Mystic Potion to a Ghost Black Pewter Calico. Closest guess I have for the all grey is Black Pewter Pin Mojave Calico, closest for the whiter baby is Super Pastel Mystic Calico Spider, maybe black pastel? It’s very hard to capture in photo but her pattern has a grayish/purplish hue to it. Only so many historical ad listings I can go through before I lose my mind haha.
(This photo is most accurate to her coloring; she seems to glow with that brighter back stripe.)