I know a lot of various hair clips and barrettes came from an accessories shop called Claire's, and I know I have a set of metal shaped clips like that which are ALMOST identical, but use different vectors! So it may be that these came out more recently than the set I have, and I never saw them before? These would have been released right before the pandemic, and I got mine several years before that.
Claire's also has an "older" accessory store called Icing, which is angled towards older tween/teen girls, but that may show up in listings as well! I'd start scouring eBay for something like 'Claire's My Little pony metal hair clip' and see if you find anything!