Maybe something like:

use warnings;
use strict;
use Data::Dumper;

my %hash = map { chomp; split ' => ', $_ } <DATA>;

my %out;

for (values %hash) {
    my ($val, $key) = split /\|/, $_, 2;
    push @{$out{$key}}, $val;
}

print Dumper \%out;

__DATA__
5030 => 5030|RED DOOR|10-14
1049 => 1049|RED DOOR|10-14
4990 => 4990|RED DOOR|10-14
959  => 959|RED DOOR|10-14
15047 => 15047|FLOWER|13+
5565 => 5565|RED DOOR|10-14
4449 => 4449|RED DOOR|10-14
1065 => 1065|RED DOOR|10-14
2992 => 2992|RED DOOR|10-14
4956 => 4956|RED DOOR|10-14
17665 => 17665|FLOWER|13+
6217 => 6217|RED DOOR|10-14
1224 => 1224|RED DOOR|10-14
424 => 424|RED DOOR|10-14
368 => 368|RED DOOR|10-14
451 => 451|RED DOOR|10-14
7752 => 7752|RED DOOR|10-14
4070 => 4070|RED DOOR|10-14
1312 => 1312|RED DOOR|10-14
17668 => 17668|FLOWER|13+
4224 => 4224|RED DOOR|10-14
3588 => 3588|RED DOOR|10-14
11076 => 11076|RED DOOR|10-14
2986 => 2986|RED DOOR|10-14
2402 => 2402|RED DOOR|10-14
10834 => 10834|RED DOOR|10-14
849 => 849|RED DOOR|10-14
2954 => 2954|RED DOOR|10-14
11 => 11|RED DOOR|10-14
4093 => 4093|RED DOOR|10-14
492 => 492|RED DOOR|10-14
1861 => 1861|RED DOOR|10-14
4384 => 4384|RED DOOR|10-14
15037 => 15037|FLOWER|11+
13044 => 13044|FLOWER|13+
899 => 899|RED DOOR|10-14
292 => 292|RED DOOR|10-14
10421 => 10421|RED DOOR|10-14
4120 => 4120|RED DOOR|10-14
5557 => 5557|RED DOOR|10-14
3859 => 3859|RED DOOR|10-14
930 => 930|RED DOOR|10-14
649 => 649|RED DOOR|10-14
7511 => 7511|RED DOOR|10-14
648 => 648|RED DOOR|10-14
73 => 73|RED DOOR|10-14
12537 => 12537|RED DOOR|10-14
2485 => 2485|RED DOOR|10-14
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