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  for my $key_hash1 (sort {lc($a) cmp lc($b) } keys %{$hash1} ) {
    if( ! exists $hash2->{$key_hash1} ) {
      print "Hash1 contains unit '$key_hash1' but hash2 has no such un
+it\n";
      next;
    }

  for my $key_hash2 (sort {lc($a) cmp lc($b) } keys %{$hash2} ) {
    if( ! exists $hash1->{$key_hash2} ) {
      print "Hash1 contains unit '$key_hash2' but hash1 has no such un
+it\n";
    }
  }

    if( $hash1->{$key_hash1} ne $hash2->{$key_hash1} ) {
      print "Both hashes have '$key_hash1' as a unit ",
            "but hash1's value is '$hash1->{$key_hash1}' ",
            "and hash2's value is '$hash2->{$key_hash1}'\n";
    }

  for my $key_hash1 (sort {lc($a) cmp lc($b) } keys %{$hash1} ) {
    if( ! exists $hash2->{$key_hash1} ) {
...
      }
    }
  }