I believe (please correct me if I'm wrong) the internals of blue and white clicky alps are (nearly?) identical …
Mostly, yes. White alps have a short
switchplate, and my suspicion is that the actuator leaf of the switchplate was stiffened with that generation (clicky=white/tactile=salmon). I've swapped out the uppers (upper shell, return spring, slider, click leaf) from blue Alps switches into the bases (lower shell, switchplate) of black Alps, and the softness of the switches is gone. The end result is a keyboard that feels like white Alps, leading me to suspect that the increase in stiffness with that generation was down to the actuator leaf.
I don't know though. Blue and white Alps are indeed very similar.
Yes, it isn't a vivid blue, so probably, almost certainly a blue cm. Sandy also seems to says so…
That's no guarantee. For any given model number, you can find that a number of switches were used. Not just blue/white/clone, but completely incompatible switches that require a new PCB and a new plate. The later Chicony KB-5181/5182 has been confirmed to have used white Alps, Cherry MX blue, SMK "Monterey", and Futaba, all mutually incompatible, so they've retooled and made new PCBs multiple times. Chicony's "official" list for that keyboard is: Alps, Cherry, SMK, Mitsumi, and Aristotle, but Mitsumi and Aristotle are not yet confirmed in the 5181/2, only in other models.
Focus FK-2001 started out with blue Alps, then white Alps, then at some point—amongst other switches—also featured the aforementioned Type III, so make/model plus "blue" isn't a guarantee, but shade of blue is pretty reliable, as I've never seen that shade of blue anywhere else.
Complicated, no? :)