You can frag the FL ones same as a mushroom, but the Yumas are too picky and may just die, better to let them split on their own or force them to grow babies by turning them way from the light so they move towards it, leaving a piece of the foot that will become another ric.
the differences are sometimes hard to tell, depending on their health, but for the most part yumas have a raised mouth and the tentacles are uneven sizes while FL has a regular mouth, not bulging out, and their tentacles are even sized through out the body.