How to compare two posts including their meta fields on a scalable base?

I have set up a wordpress in a way that posts can be cloned and be altered by a different author. whenever this is the case, i want the administrator to be notified via an additional tab in the edit.php screen like Changes(5) where only posts are listed whose content and meta fields differ from those of their originals.

to achive this i thought of writing some sort of hash whenever a post is saved to then only compare hashes.

is there a better way of doing this?