This is the rationale Mark-Jason Dominus provided for the creation of
clpmod:

    The comp.lang.perl.misc group presently has very high
    traffic: typically about 250 articles per day.  Much of this
    traffic is given over to people asking off-topic questions,
    and questions answered in the FAQ.

    In these circumstances, a number of regular posters to the
    group have stopped reading comp.lang.perl.misc, while new
    readers can find it difficult to find relevant posts.  The
    result is reduced usefulness of the existing
    comp.lang.perl.misc newsgroup.

    This comp.lang.perl.moderated group is proposed as high
    signal-to-noise group where readers will not be subjected to
    the types of articles described above. The intention is to
    provide a useful resource for inexperienced Perl programmers
    and to attract and retain experienced programmers who can
    make a substantial contribution to the group.

    comp.lang.perl.misc would still be left in place for more
    general discussion, and for those topics that no one seems
    to agree on a place for.

However, if you're asking this question or don't buy the above rationale,
there is no reason for you not to continue using clpmisc.  The existence
of clpmod has no bearing on clpmisc.