Data::Compare doesn't seem to offer anything natively.
However, you can get the result you want using:
$h2->{FOO}->[1] = $h1->{FOO}->[1];
before comparing.
Of course, this modifies $h2. If you need to preserve $h2, then an option is:
my $save = $h2->{FOO}->[1];
$h2->{FOO}->[1] = $h1->{FOO}->[1];
... compare ...
$h2->{FOO}->[1] = $save;
However, if the number of exceptions is large, this may not be ideal. If you are not worried about efficiency, then you can make a copy of $h2 (using Data::Dumper::Deepcopy() perhaps), modify it as needed, and compare the result with $h1. As you mentioned that the real structure is complex, this may be too great a hit on performance / memory.
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