Change the lighting, and the difference in materials and positions and reflections tend to mask slight color differences. Your results may differ. I found a side-view of the toilet that showed the trapway design...it seems that it makes a significant right-angle turn near the bottom without a nice curve. Might be an issue. Waste moves best when there aren't any sharp turns. Are you firm on that brand? Others have some similar asthetics with smoother trapway designs.