First of all, the DATA filehandle begins after the __DATA__ token, not __END__
That's not always correct. perldoc perldata
__END__ behaves like __DATA__ in the toplevel script (but
not in files loaded with "require" or "do") and leaves the
remaining contents of the file accessible via "main::DATA".
$ cat data_eq_end.pl
print for <DATA>;
$ perl data_eq_end.pl
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