It is a "Skinny phase"
IMO, if you do not know the direct lineage of a cal king, then it is a captive bred phase. To sling the "coastal" and "desert" phase around is to assume that is where they came from. Unless that IS where they came from. Cal kings are found in other areas and other states besides California, and coastal and desert areas.
So what would the cal kings from the mountains of Arizona be called? I've seen them black & white banded (almost 50-50), brown and white banded (almost 50-50), black with thin yellow bands, brown with thin yellow bands. All of these have been found on my property here at 5,000 feet elevation. The only type of cal king that I have not seen in Arizona is an aberrant, just bandeds.
So it DOESN'T have to be either "desert" or "coastal" unless it came from there.
Feed the sucker!

Kerby...