From what i've read, i havent played any of the 2 so i might be off, the main character role in the fight and the job system is the same in both Kamipro and Granblue, but, seems like in Granblue you can level up any job, while in Kamipro, adquiring a job costs costs certain amount of points. So you can't unlock and upgrade every job in Kamipro, unless you do all events as some events give some points.