Difference Between N95 and KF94 Masks: Charted Out
They look similar, and they filter a nearly identical percentage of particles—95% versus 94%. This chart from 3M explains the differences between the N95 and “first class” Korean masks. The columns highlight these two types of mask.
On the metric that most people care about (filtration effectiveness), they’re nearly identical. In most circumstances, mask users will not care about a 1% difference in filtration.
source : https://smartairfilters.com/en/blog/difference-between-n95-and-kf94-masks/