I'm with Eily. Data::Compare does this work very well. Here's an example:

use warnings;
use strict;

use Data::Compare;

my $part = {
          'c' => {},
          'func' => []
        };


my $main = {
    'a' => {
        'b' => {
            'c' => {},
            'func' => []
        },
        'func' => [
            'd',
            'e'
        ]
    }
};

for my $inner (keys %$main){
    for my $key (keys %{ $main->{$inner} }){
        my $its_here = Compare $part, $main->{$inner}{$key};
        if ($its_here){
            print "found at location $key\n";
        }
    }
}
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