>>19015884except that the point was to show that this version of charizard is different.
stop for a moment and consider why it would be bad for them to keep the orange color scheme on both, I suspect they actually kept them similar at the start but playtesters had difficulty telling the guys apart which is why they changed the wings and added the spikes. When that didn't work they had to cast their gaze towards redesigning it with different colors in mind so you KNEW it was different.
That shade of blue also makes sense as blue fire burns hotter than orange / red flames.