Prunus accolade is winter hardy in zones 5 and warmer, while some Prunus species are hardy in zone 4. If you are in zone 4, perhaps this is the difference. Otherwise, your tree could be suffering from transplant shock, which is very common in the first year:

https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm