$ /usr/bin/zip -D test1.zip /usr/local/lib/perl5/5.10.1/*.p[ml]
  adding: ...
$ /usr/bin/zip test2.zip /usr/local/lib/perl5/5.10.1/*.p[ml]
  adding: ...
$ ls -l test1.zip test2.zip
-rw-r--r-- 1 almut almut 526059 2010-05-06 01:23 test1.zip
-rw-r--r-- 1 almut almut 526059 2010-05-06 01:23 test2.zip
$ cmp test1.zip test2.zip
(no output)
$ md5sum test1.zip test2.zip  # just in case cmp is wrong :)
aa105cb65d74b31e4da18b2bd1a027d6  test1.zip
aa105cb65d74b31e4da18b2bd1a027d6  test2.zip