During the desert battle scene it wasn't the kraken part that I liked but the repetitive building part that starts when they call in airsupport. You hear that same repetitive theme later on when Optimus pulls that 180 turn on a two lane road.
I found song that hans zimmer and steve jablonsky both worked on. It is from tears of the sun. The soundtrack itself wasn't the greatest, the the song was awsome. I believe it is call "jablonsky variations of cameroon outpost" It is really sweet. I also just found out that bits and pieces of the armegeddon score was done by Jablonsky. That quick military sounding que that is loud and obnoxious I believe was done by him, considering there is a que in transformers that is almost Identical.
Of course songs that sound similar is going to occur constantly. Take for example the original Klaus Bedelt Pirates of the Carrabean. Then listen to one of the themes from Hans Zimmer's Gladiator. If you haven't heard Either of those I'll upload a side by side comparison.
http://www.esnips.com/webfolder/ce38110d-c775-48db-aa60-d205e00b72b7
This has Pirates and Gladiator so you can compare them side by side. As well as The tears of the sun song.