A big study done with different mask types, homemade, surgical, n95, kn95.
Their findings showed differences in particle emissions, but no mask was well fitted, just casually worn by the test subject.
"The fit of surgical and KN95 respirators differs substantially. Here,
no fit tests were performed to ensure good seals of the KN95 respirators. It may be that imperfect fitting of KN95 respirators allows for greater escape of particles from the mask-covered environment compared to the more flexible surgical masks. Regardless, all surgical masks, KN95 and N95 respirators tested here provided substantial reduction of particle emission compared to no mask."
source
https://www.nature.com/articles/s41598-020-72798-7#citeas https://doi.org/10.1038/s41598-020-72798-7