Depending on the amount of damage to the pancreas it can be treated more like T2 or more like T1, both are fine as long as they work.
An important difference between the treatment of T3C and other types of diabetes is that with T3C it's often needed to supplement enzymes for digestion (creon). In T1 and 2 the production of those enzymes isn't affected, but in T3C often it is.