well the difference i noticed between the 2 are : got no hairs and dust in my salt + more calcium.
Seriously on 3 batches of IO i got long hairs in it, an they're ain't mine nor my friends.
BTW even if Xenia are considered easy corals, they can be a pain. I think they can propagate easily so they can be considered easy for that, but they can vanish quickly with pristine water.
You should check your Xenia and if it smells, well you may have a clue if it's going to be ok or not.