I've not played either of those but I've certainly heard they're good quality games. IIRC they are pretty true to the pathfinder rules so I guess my initial thought that RT looks like a close match to the RT PnP rules might be correct. It's a point in it's favour at least.Rogue trader is made by the same dev that made Pathfinder; KIngmaker and Pathfinder: Wrath of the Righteous so I pretty much expect Rogue Trader to be a 40k variant of those.