De man apt-file
:
search
é
Search in which package a file is included. A list of all packages
containing the pattern pattern is returned.
Since Contents files does not contain directories, the pattern must
match (part of a) file name.
By default, the search action interprets its pattern as if
--substring-match was specified.
E find
é
Alias for search.
Portanto, ambos são iguais.