SEATTLE — When CJ Olive Young said it would open its first U.S. stores in California, the reaction was swift. On social media, K-beauty fans celebrated the idea of finally walking into a brick-and-mortar version of the Seoul retailer they have been ordering from for years. For many shoppers here in the U.S., Olive Young is more than a chain. It represents what’s trending in Korea right now. The sheet masks stacked by the register. The sunscreen that sells out in Seoul before it appears on Instagram. The perception that you are getting the same products sold in Korea, not a separate export version. That is why the excitement has come with a pointed question: will the products on U.S. shelves be exactly the same? Since news of Olive Young’s U.S. expansion first surfaced, online forums have buzzed with questions about whether the products would remain unchanged. “Most of the brands that sell a lot to the U.S. changed to a separate U.S. formula (aka worse) so I expect those will be the imports unless the FDA gets cool with a lot of technologies really quickly,” one Reddit user wrot