Try using grep.
my @a1 = qw( A B );
my @a2 = qw( A B C D A D B A C );
foreach my $el(@a1){
my $count = grep /^$el$/, @a2;
print "$el is in Array2 $count times\n";
}
produces
A is in Array2 3 times
B is in Array2 2 times
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