That (usually) has shorter, denser foliage. But an abnormally low altitude specimen could look like that.
Hmmm . . . that's within the altitude range for both, close to the upper limit for P. monticola, and close to the lower limit for P. albicaulis. Have you got any larger, higher resolution pics? Or collected samples? That would help. The most useful distinction is that P. monticola has only thinly hairy shoots, while P. albicaulis shoots are densely hairy.