First transform one of the hashes to use all lowercase keys. Then check existence of lc $other_key.
Here's a Perl 6 solution:
my %lc1 = %hash1.keys>>.lc Z %hash1.values;
for %hash2.keys -> $k {
say "$k ", %lc1.exists($k) ?? 'Matched' !! 'Did not match';
}
Transforming the code to Perl 5 shouldn't be too hard.
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