Hey! Yes, very common for Zoas to morph under different lighting/flow/nutrient parameters. Still magicians (Zoas cannot morph so much that they change names EX: a magician can never morph into a charmander) but if you want the white specks back I suggest slowly moving them to higher light. If both pics are of the Zoas in your tank right now, they look like they are stretching for light slightly and doing this would also help them “sit down”. Good luck and happy reefing!