Once Upon A Time/Snowdrop similarities

So as a fan of Once Upon A Time, I was watching the most recent episode and couldn't help thinking of Snowdrop during one part in particular. Note this is heavy on spoilers so if you haven't seen either the most recent episode or even Snowdrop (which why would you not have seen Snowdrop?) then please navigate away from this page. For the rest of you, feel free to read on. So in the most recent episode Anna and Kristoff are thawed out back in Arendelle when the Snow Queen is about to unleash the Spell of Shattered Sight on Storybrooke and the 2 of them go on the search for a wishing star statue that Anna and Elsa's parents sought out. They seek help from Blackbeard who backstabs them for Hans who has them put in a chest and tossed into the sea. Meanwhile, in Storybrooke, Elsa is still trying to find her sister and so she has a locator spell placed on a snowflake necklace that was Anna's. The necklace glows brightly as it leads Elsa and Emma to the beach before it goes dead. Elsa believing Anna is dead pours out her soul to her sister saying how she wishes that she could've seen her again. This causes the chest that Anna and Kristoff were in to be magically summoned onto the beach where the sisters are reunited, both confused as to how this happened before Anna realizes that her snowflake necklace was the wishing star.. Seeing this episode, it made me think of the similarity to Snowdrop where Snowdrop shows up at the Spring Sunrise Ceremony with what would become the first snowflake. She refers to it as a star. More specifically "a Star for Winter". She then goes on to talk about how winter is still important despite the fact that no pony seems to like it and how maybe they need to make wishes on snow like they do with stars in order to have a happy winter.. Considering Snowdrop came out a year and 9 months ago approximately, I couldn't help but wonder "Did Edward Kitsis and Adam Horowitz get inspired by Snowdrop to put that in that OUAT episode?" What do you guys think? Feel free to leave your thoughts below and my final chapter should be up within the next 2-2 1/2 weeks or so.