It's an interesting discussion, but why does it really matter? At the sensor level both cameras gather about the same data. Then the people take over. The RAW data has an in camera profile assigned - some of which you can control and some of which relate to your defaults. When you use ACR or Lightroom to import the image, new profiles are assigned. They may be based on your camera's selection, or default Adobe profiles, or Adobe's interpretation of your camera profile. White balance is an interpretation of RAW data and similarly varies - daylight can be whatever color Adobe or the photographer wants. The ambient light - and the reflection of light off surfaces in the area - all contribute to color and white balance. If you have a specific color tint you want, the HSL panel can be used.
Throwing a wrench in the works, newer cameras constantly tweak the way color is processed. As you add color depth different colors are impacted. The color depth of the newest cameras is greater than older models.
The images here are sRGB - or possibly well under sRGB on a laptop. Would it make any difference if you viewed the images on a different monitor or using a different color space?
At the end of the day, you can choose whatever color you want for skin tones. There is an art to choosing color and desired skin tones. I won't refer to it as perfecting skin tones because it is really a matter of conditions and choice.
The place I would really struggle is using both cameras for an event - like a wedding. There are good reasons to use two different brands. To present images to a client, I would want the color of skin to be consistent. So I need to apply a camera specific profile to one or both images to make them look the same or nearly the same. And that is to my taste - and the client's taste may be slightly different.
So maybe a better question - given the skin tones of the two images are different and you want them to be the same - what adjustments are needed? Are there specific tools that help?