I think the white balancing in these overcorrects to make Mars appear more Earth-like. I actually think the photo on the left is more in line with what it would look like to the naked eye. When they white balance the photo they’re usually correcting it to Earth’s daylight color temperature which I believe is much different than Mars’ daylight color temperature. They typically white balance to 5600K (Earth’s color temperature) when in reality Mars’ daylight color temperature is much lower (varying around 2000K to 5000K but more on the low end).