my $table_tmpl = new HTML::Template filename => 'table.tmpl';
my $result     = new HTML::Template filename => 'comparison_page.tmpl';

my ($first, $second);
$table_tmpl->param(data => get_table_data(key => 'first'));
$first = $table_tmpl->output;
$table_tmpl->param(data => get_table_data(key => 'second'));
$second = $table_tmpl->output;

$result->param(first => $first, second => $second);

print $result->output;