I spent a few minutes searching for information on this.
Coconut Flour is made from fresh coconut meat. The meat is dried and defatted and then finely ground into a powder very similar in consistency to wheat flour.
Coconut Powder varies in definition between Dessicated Coconut, Coconut Flour and Coconut Milk Powder.
In my opinion, the proper definition of Coconut Powder should be the same as Flour, as Coconut Milk Powder is made by evaporating the coconut milk.
So with all the confusion that surrounds 'what is coconut powder?' I would refer back to CA's comment and ask the originator.
For what it is worth, I would opt for the ground variety over the evaporated, when using in a curry.