You can do it with script. But something better is also needed in the main program.
I got something like this on my list. But the problem is that it is not just to add all kind of alternatives you can have.
The combination are endless. What is needed is a Advanced compare where you can enter what it should compare.
But that require a lot of figuring out what it actually should do and such.
How should it work, What should it compare and how and is there UI or not and so on. And that is not something I have had time for yet.
(To Anyone. Fell free to write up something how it should work, And it might be added quicker )