OC4Me Chlorophyll

my question here is that when we apply C2RCC over an image of Sentinel 3, it gives us Chlorophyll concentration. but it does not give any information about whether that computed chl belongs to “a” or “b” category? MODIS usually gives this info. I want to compare both the images but confused.

The C2RCC processor provides chlorophyll-a data.
It is explained in http://step.esa.int/docs/extra/Evolution%20of%20the%20C2RCC_LPS16.pdf