Chickpea flour is not the same as besan or gram flour. Chickpea flour is made from white chickpeas whereas gram flour is made form split brown chickpeas, or chana dal. They have a similar flavour and consistency but do vary a bit. Chickpea flour, or garbanzo bean flour, is the most common in stores in my area so I have only tested this recipe with it. You should be able to use besan or gram with some minor adjustments, such as a bit less liquid. Chickpea flour tends to dry out more than besan so besan may actually be a better choice here! The muffins are nice and moist but they could easily become dry if you use too much flour. For the best results, I recommend using a kitchen scale to measure the ingredients accurately.