They are currently handled the same way if you are simply cancelling. Theoretically, a "change" to a main cabin fare ensures you get the seat/fare quoted for the new itinerary, as inventory could conceivably disappear if you simply cancel then rebook a new itinerary using wallet funds 30 seconds later. Also if there were ever a glitch/delay in getting the wallet funds credited immediately, you might also have to come out of pocket for the full price of a new ticket (or wait)--I've not experienced this, but others may have.