It occurred to that with the changes that Google have made (no fixed directory location hardcoded in the binary), it is no longer necessary to perform a system wide install. Hence new options are possible, specifically a given Chrome version can now be stored in its own, user owned directory along with its settings (profile), thus making it entirely self contained. This in turn makes it easier to compare builds from the same channel.
I knocked up a quick script to test this (linked below). I will probably tweak it further in the future to automate downloading the latest builds from each channel, like the multichrome script. For now it can just unpack and configure a Chrome rpm you specify on the command line.
Anyway if you want to try: https://gist.github.com/ruario/9728785