Man pages matching name sane-sm3840 in section 5:

sane-sm3840.5.en	debian 10 / libsane-common
sane-sm3840.5.en	debian 11 / libsane-common
sane-sm3840.5.de	debian 11 / manpages-de
sane-sm3840.5.en	debian 12 / libsane-common
sane-sm3840.5.de	debian 12 / manpages-de