Grammys nominations ≃ multiple Daesang sweeps How many artists have daesang sweeps? How many artists have Grammy noms? The math works out.
They're so different, and not really a fair comparison - Grammys has the name and prestige but is also based on a disgustingly corrupt organization and super easily manipulated. It's only such a big deal because the modern international music conglomerates basically created and run it like their personal snack bar 90% of the time. They also run like 90% of the world music trade (not much of an exaggeration, I think its in the 80s) so it makes sense that it would more impactful and be considered 'important'. The Grammys are literally the house that Monopoly and Anglosphere Xenophobia built. The Korean awards are newer and more based in Asia, so they don't have ties to the global scene.