OS X: move to different partition

I have 4 partitions on my Mac mini, one for OS X 10.6, one for OS X 10.5, one for OS X 10.7 and one data partition. I now want to move OS X 10.7 to the first partition (assuming it would be faster) instead of reinstalling it. Is this possible using Disk Utilities, e.g. by having booted to OS X 10.5.