#!/usr/bin/perl

use strict;
use warnings;

open (OUT,">outputfile.txt");
open my $fh1, '<', 'file1.txt';
open my $fh2, '<', 'file2.txt';

while(
  defined( my $line1 = <$fh1> )
  and
  defined( my $line2 = <$fh2> )
){
  chomp $line1;
  chomp $line2;
  
  my $string = $line2;
  $string =~ m{^*\t};
 print $string."\n";
  if( $line1 eq $string ){
    print OUT $line2."\n";
  }else{
    print OUT $line1."\n";
  }
}

close $fh1;
close $fh2;
close OUT;