What Possible Inconsistency Do You Observe in the Color Coding

What possible inconsistency do you observe in the color coding of this diagram?

A) Small intestine plays different roles in the three fermenters but is coded the same way in each diagram
B) The stomach and abomason do not play the same digestive role
C) The stomach should be present in all three digestive types
D) Cecum and colon are always next to one another,yet their roles are sometimes classified as one,and at other times as two different fermentation steps
E) None is a possible inconsistency