I think the initial RP, population, and other values only apply to the player. The NPRs are probably generated the way they usually are, with a random population based on (but not necessarily equal to) the player's. Their RP should be the default for that size population, normal (100%) industry, and their government type. Their population, and thus RP, should also be scaled by difficulty.
NPRs generated later in the game supposedly get X years' worth of additional RP, where X is the time since the game started (initial year not relevant, so change that 2025 at whim). IIRC this has been confirmed by Steve. I'm not so sure about the initial NPRs.