they arent anything alike. diaz was a pressure fighter/volume puncher. he would move his head, jab himself in and throw clusters of punches to the head and body.
garcia isnt aggressive like that at all, doesnt crowd or bully opponents and dont throw as many punches. dont throw the same kind of punches either or even fight from the same range. has very diffrent defense too and their bodymovement in general share nothing in common.