Sim, não há problema em fazer isso.
No crontab(5)
manual :
The "sixth" field (the rest of the line) specifies the command to be run. The entire command portion of the line, up to a newline or a
%
character, will be executed by/bin/sh
or by the shell specified in theSHELL
variable of the cronfile. A%
character in the command, unless escaped with a backslash (\
), will be changed into newline characters, and all data after the first%
will be sent to the command as standard input.