Yep. Looks like White Balance for sure...you can tell that easily from the change in background color...which looks like it was probably rendered pretty good in the first and way too warm in the second.
Many cameras will let you set a manual white balance...typically you take a shot at a white piece of paper and it sets the white balance for subsequent photos. And, most all cameras have presets for sunny, cloudy, incandescent light, fluorescent light, etc. So, even if your camera doesn't have a manual setting, it may have a preset that will get you consistent output. I'd suggest finding a