This seems a bit of work to do strictly in Perl, but this should do what you want to do. However I do believe that davido's suggestion of the module is cleaner to work with as you're not doing the conversion of the hash to a sorted array, then to a string.

#!/usr/bin/perl/

use strict;

my %aa=(uno=>1, due=>2);
my %bb=(due=>2, uno=>1);

my ($aa,$bb,@aa,@bb);

**updated**
@aa=sort(%aa);
@bb=sort(%bb);

$aa = join("",@aa);
$bb = join("",@bb);

**updated

if ($aa eq $bb){
                print "Matches!\n";
                }
else{
     print "No match!\n";
     }
[download]

Update: As both samtregar and <a href="http://www.perlmonks.org/index.pl?node_id=56270>greenFox point out the original code blows up with the data they show in their nodes. However replacing the

@aa=%aa;
@bb=%bb;

$aa = join("",sort @aa);
$bb = join("", sort @bb);
[download]

with

@aa=sort(%aa);
@bb=sort(%bb);

$aa = join(" ",@aa);
$bb = join(" ",@bb);
[download]

I believe should do what I originally intended.

Sorting the hash, not the array, and leaving the space in should solve the problem found by the other monks.