OK, but you are still not trying to do what I suggested.

Minimize your code and create much smaller pieces of test code so you will be able to learn how to debug your own code.

I'll give you another example what I am talking about. In the next piece of text code I have found multiple problems, so play around with it a little bit and try to fix it yourself:

use strict;
use warnings;
use Data::Dumper;

my ($file_1, $file_2) = ('output1.csv', 'output2.csv');

open my $fh, '<', $file_1  or die "Can't open $file_1: $!";
my %first = map { chomp; split /\s*,\s*/ } <$fh>;

print Dumper( \%first ) ;

open    $fh, '<', $file_2  or die "Can't open $file_2: $!";
my %second = map { chomp; (split /\s*,\s*/)[1,2] } <$fh>;

print Dumper( \%second ) ;

foreach my $name (sort keys %first) {
   if (not exists $second{$name}) {
      print "Devices should be added: $name\n";
      next;
   }
   if ($first{$name} eq $second{$name}) {
      print "Match found $name, $first{$name}\n";
   } else {
      print "UPDATE need be done for $second{$name}\n";

      open ( my $input_1, '<', 'output1.csv' ) or die $!;

      while ( <$input_1> ) {
         chomp;
         print "   input_1 = $_\n" ;
         my ($name_1, $ip_1) = split /,/;
         print "   (1) $name, $ip_1\n" ;
         (my $id, $first{$name}, $second{$name}) = split /,/;
         print "   (2) $id, $first{$name}, $second{$name}\n" ;
      }
   }
}
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