C3, C4, and CAM plants all carry out the same photosynthetic functions. They all have light-dependent reactions and the Calvin-Benson cycle. The major difference in C4 and CAM plants is when and where the carbon fixation initially occurs. C3 plants carry out their light-dependent and Calvin-Benson reactions in the same place at the same time: in the mesophyll cells during the day. C4 plants carry out their light-dependent and Calvin-Benson reactions at the same time, but in different places: the light reactions take place in the mesophyll cells while carbon fixation occurs in the bundle sheath cells. CAM, like C3 plants, perform their light-dependent and Calvin-Benson reactions in the same place and at the same time, but they get their carbon from a store they build up overnight.
http://tables-evo-sci.blogspot.com/2007/11/comparison-of-c-3-c-4-cam-plants.html
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