Interestingly, the Python code fails if w1 contains characters outside of PCHR. Therefore, using only valid characters the following should work:
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
my @pchr = qw( K Q R B N P );
my $w1 = 'QRKPNBQ'; # <- Q is repeated!
my $w2 = join "", map $_ x (() = $w1 =~ /$_/g), @pchr;
say "$w1 \-> $w2";
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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