Can an FFP2 be compared to a N95 and KN95?

FFP2, N95 and KN95 face masks are not the same. The differences are expressed for some test types and for some requirements, but studies show that there is no substantial difference between their effectiveness. The respirators N95 (American standard NIOSH-42CFR84) and KN95 (standard GB 2626:2006) are not CE marked but have been tested against similar standards to the European ones.