Running a script - perl script.pl - the tokens make no difference. But if you invoke perl on the command line to read STDIN and paste the script, __END__ makes DATA into STDIN, and you have to type Ctrl-d to close STDIN/DATA. Not a big deal, but that's the difference ;-)
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
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