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for (0 .. $#mapping) {
    return 0 if $self->{Matrix}[$row_index][$_]
             != $other->{Matrix}[$mapping->[$row_index]][$mapping->[$_
+]];
}
return 1;

my $self_row  = $self->{Matrix}[$row_index];
my $other_row = $other->{Matrix}[$mapping->[$row_index]];
...
    return 0 if $self_row->[$_] != $other_row->[$mapping->[$_]];
}
return 1;