A:Answer Well, I had the same exact question and I googled it: "From what I've seen in the past, the "KB" SKUs are the Best Buy specific models that are different in model name only to prevent price matching with other retailers". Credit to Broncho89
https://www.bestbuy.com/site/questions/evga-geforce-rtx-3060-ti-ftw3-gaming-8gb-gddr6-pci-express-4-0-graphics-card/6444444/question/216e3d80-7d88-3358-a798-b332b49dd8c2