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my $old_cust_data_href = load_old_cust_data($old_cust_data_file);
my $new_cust_data_href = load_new_cust_data($new_cust_data_file);
my $result_hash_ref = data_compare($old_cust_data_href, $new_cust_data
+_href);
# ...

my $old_cust_data_href = load_cust_data($old_cust_data_file);
my $new_cust_data_href = load_cust_data($new_cust_data_file);
my $result_hash_ref = data_compare($old_cust_data_href, $new_cust_data
+_href);
# ...

my $cust_data_href{$_} = load_cust_data($cust_data_file{$_}) for qw /o
+ld new/;
my $result_hash_ref = data_compare($cust_data_href{old}, $cust_data_hr
+ef{new});