Product page question (description cross selling)

Does anyone know of a mod that would enable me to have listed on a products page, other products containing similar descriptions automatically.

I have products that are the same but listed in multiple places as they are separate products, but are actually the same part.

I could use some kind of cross selling mod, but that would have to be done manually.

I suppose there would have to be a call to the relevant data in the sql table, which would compare it against other descriptions to see if there were any similarities...

is that possible or would it create far too much load on the database?

There are several free add ons at http://www.zen-cart.com/index.php?main_page=contrib_search_result&search_in_description=1&keyword=cross+sell

I know, but none of those are automatic, they require setting the links