I don't believe Kingston (HyperX) manufactures their own RAM anymore. They buy the RAM chips from another company, package it on their PCBs, and sell it as HyperX RAM. That may be why the price is higher (Kingston is a middleman, and they need to make a profit).
The vast majority of the RAM chips today (98%) are made by Samsung, SK Hynix (Hyundai), and Micron (Crucial). Except for a few bit players you've probably never heard of, everyone else just buys from these three main suppliers and repackages.
https://www.statista.com/statistics/233419/global-market-share-of-dram-suppliers/
Of the three I prefer Crucial because they're American (no racism - I'm Korean, I just figure I should support the companies in the country I'm living...