Can't get the equal function to work using two functions as arguments

The below gives me the number of open "(" in the title.

Using ascii code 41, it gives me the number of ")" in the title tag.

Now, if I put both inside of the $eql function to see if they match, it doesn't work. Ideas?

Edit: Subtracting them works though, that's a way out.

How did you apply the equal function?
Usually, it is part of a $if()-statement like $if($eql(...

If you are looking for files with not matching pairs of brackets, you could also use such a filter:
%title% HAS "(" AND NOT %title% HAS ")"