I can understand that, still corresponding to what I said, isn't ampacity tables somewhat the same concept, if carrying x amps in an ambient of 30C won't the conductor ampacity in the table be based on 60, 75 or 90 C conductor operating temp? Maybe some fudging in there for some safety factor but kind of the base of the ampacity tables?

I think I understand what you are getting at, but no, the two concepts are unrelated.

For instance, the K factor is directly related to conductor operating temperature, not ambient temperature, so a #1/0 conductor operating at a conductor 75deg in a 30degC ambient and a #1/0 conductor operating at a conductor temperature in 40degC ambient will have the same resistance and therefore, the same K factor. Change in ambient temperature does not directly affect the K factor.

A change in ambient would change the voltage drop, either through proper design or misdesign, A feeder of the same conductor size and length, operating at the same conductor temperature will have less current at the 40deg ambient, therefore less voltage drop. A feeder of the same conductor size and length, with the same current will operate at a higher conductor temperature, therefore increasing the conductor resistance (and K factor) and increasing the voltage drop.