This isn't really a similarity but I find that the two are rather complimentary. I love using Rockstar soap and slathering O on after. They go so well together. The thing I love about soap from Lush is that the scent remains in an unobstrusive yet noticeable way after my shower.
It looks like I need to track down imps of Jailbait and Bon Vivant sooner rather than later, to test them out with some Rockstar!