PS14K is normal clip similarly to OBSF
and sorry but K is probably from sKeleton buttons:)
KN is nut
big N is nut, big F- is clip/flip:P
for me nut is better
PS14K is stopped production use micro how PS14D (standart sanwa microswitch fit on this buton), some colours be sold out
new ver is PS14 KN use micro how PS14GN (standart sanwa not fit but GX switch from PS14GNX or OBSF RG fit)