I think they did the same thing with those 18MP sensors too where each line had a sensor that varied slightly from the others, even though they were all 18MP. Moving forward, hopefully, they can get some cost savings by just having the same sensors and differentiating on features, body size, buttons, etc. Fabbing sensors isn't exactly cheap, and they can't be doing themselves any favors to have so many different sensor variations, even if it is as relatively simple as just changing the pigments/dyes used in the CFA filters. From what I understand, that's an integral part of the chip making process, so it's not like they're just taking a sensor chip and slapping a different CFA filter on the top when they're putting the camera together on the production line.