yeah, just chop them off from the hash key. 
my %hash = map { my($k,$v)=split/#/; $k=int($k); ($k,$v) } @array2;

for (@array1) {
   my $k = int($_);
   next if !exists($hash{$k});
   print("$hash{$k} = $_\n");
}

[download]

Fix if you have duplicates: 

my %hash;
for (@array2) {
   my ($k, $v) = split /#/;
   $k = int($k);
   push @{ $hash{$k} }, $v;
}

for (@array1) {
   my $k = int($_);
   next if !exists($hash{$k});
   for my $v (@{ $hash{$k} }) {
      print("$v = $_\n");
   }
}

[download]

In reply to Re^3: checking the matches by ikegami
in thread checking the matches by tweetymonk

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