The closest thing I have ever found to that is http://packages.linuxmint.com/list.php?release=Maya
(if Maya is what you are interested in), but of course this only shows you what Mint have added, not what Ubuntu included in the base install. Of course you could always go to http://packages.ubuntu.com/precise/
and look through their list of packages, but I wouldn't fancy the job myself
. Not only that but it wouldn't tell you which packages Mint may have removed or altered.
Short answer then is no (to the best of my knowledge), but I have often wished there was one, it would come in quite useful at times, particularly answering forum questions when you don't really know what tools are installed by default and what you yourself have added.
Fujitsu Lifebook AH532 Laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Ubuntu12.10 (Unity), Mint14 (Cinnamon), Manjaro (Xfce).