My easy answer is that Unix is Unix (which is the basis of all Mac OSX.xx operating systems), and MacJanitor is executing Unix commands, so ... no difference. But I have no practical basis for that opinion.
It won't hurt, I feel confident. If you go to MacJanitor web site, it might say you need the latest version, but not necessarily because earlier ones won't work. But for the price, it would be pretty easy to get current.
That's 2 paragraphs of no answer at all, but I myself am not worried about it.
Scott