Difference between Brazillian and Japanese juisitsu?

ive been practicing BJJ for about a year or so now, teaching myself techniques. ive nvr had professional lessons. i want to join a gym now but there are only japanese juijitsu gyms by me. if i were to start JJJ would it be a difficult transition or are the disciplines very similar? i really like BJJ and if the difference is dramatic i dont think i would like it as much.