my @array1 = (
 {'platformid' =>  '22', ... },
 {'platformid' => '100', ... },
 ...,
 );
my @ordered_array1 = sort { $a->{platformid} <=> $b->{platformid} }@array1;  # ascending numeric sort
...;
my $rc = Compare(\@ordered_array1, \@ordered_array2);
...;

##</code><code>##

my @array1 = (
 {'platformid' =>  '22', 'some' => 'stuff', ... },
 {'platformid' => '100', ... },
 ...,
 {'platformid' =>  '22', 'other' => 'things', ... },
 ...,
 );

##</code><code>##

my @array3 = sort { 
    $a->{platformid} cmp $b->{platformid} 
    or 
    $a->{da} cmp $b->{da} 
    or 
    $a->{ma} cmp $b->{ma} 
    or 
    $a->{os} cmp $b->{os} 
    or 
    $a->{cc} cmp $b->{cc} 
    or 
    $a->{objecttype} cmp $b->{objecttype} 
    or 
    $a->{host} cmp $b->{host} 
    or 
    $a->{size} cmp $b->{size} 
    } @array1;

##</code><code>##

sub enormously_complex_compare {
    $a->{platformid} <=> $b->{platformid}  # numeric?
    or 
    $a->{da} cmp $b->{da} 
    or 
    $a->{ma} cmp $b->{ma} 
    or 
    $a->{os} cmp $b->{os} 
    or 
    $a->{cc} cmp $b->{cc} 
    or 
    $a->{objecttype} <=> $b->{objecttype}  # numeric?
    or 
    $a->{host} <=> $b->{host}  # numeric?
    or 
    $a->{size} <=> $b->{size}  # ??? comparing array references ???
    }

my @array3 = sort enormously_complex_compare @array1;
my @array4 = sort enormously_complex_compare @array2;
...