Ball anemones are Corallimorphs, same as mushrooms, but they come from different families in the order Corallimorpharia. Not all nems with ball-shaped tips are ball nems though.
That said, seeing the ball shapes on a few of the tentacle tips, I'd like to suggest the club-tipped anemones again for those who are better with nem ID to consider:
I'm not a nem expert by any means, so hopefully someone can tell if I'm way off base, but might it possibly be a Telmatactis sp. such as Telmatactis ternatana, T. decora, or T. panamensis?