When considering longitudinal CA, one must see the range of colors as a linear spectrum, rather than a circular color wheel. Infrared light with its very long wavelengths is on one end of the spectrum, ultraviolet with a very short wavelength is on the other. In between you have the visible spectrum: red, orange, yellow, green, blue, indigo, and violet in that order.

If a lens is optimally focused for the center of the visible spectrum (green), then the colors closest to the extremes will be the most affected by longitudinal CA (red on one end, purple on the other). If the lens is focused more for the blue wavelengths then the red on the opposite end of the spectrum will be most prominent. If the lens is focused more for the yellow wavelengths, then the purple will show up more. If you are seeing a lot of red and purple CA, then you are probably seeing longitudinal CA.

With transverse CA it depends more on which colors are brightest in the scene. If you are noticing a lot of green CA, then you are probably seeing transverse CA.

Yellow and blue are closer to the middle of the visible spectrum on either side of green in the middle. It is not likely you would ever see that combination of any type of CA, and almost certainly unlikely to see longitudinal CA in that color combination.