Thanks. I figured they likely were, but wasn't sure if there was any similarity that would make buying both redundant.
No, there are not similar at all. No need to worry about that. One is quite complex while another one is relatively simple. It is very early in the morning here, I just need my head to clear up a bit. There is no need to worry about that at all.
PR and SJ are both based on the same core concept and gameplay, with PR being a more complex boardgame, and SJ being a lighter card game take on the idea. To make things much easier for you, though, PR feels a lot like Le Havre, which you really didn't like, so you're likely to vastly prefer SJ.