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/shor by the shell specified in theSHELLvariable 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.