The Congressional Budget Office has done such a comparison and forwarded it, on 20 January 2011, to the Honorable Steny H. Hoyer, Democratic Whip in the House of Representatives. Copies went to a lot of other folks.
If you are interested in this eight page document (plus cover letter), it can be found here.
I didn't find any smoking guns or any blinding insights, but it was informative.
Regards — Cliff