Place half the pie filling on the bottom of an 8 inch square baking dish. Pour half the pineapple over cherries. Sprinkle half the cake mix on top of the pineapple. Place butter in a 1 cup measure. Microwave at high (100%) until melted, 1 to 1 1/2 minutes. Drizzle half the butter over cake mixture. Sprinkle half the coconut over top. Sprinkle half the nuts over top. Cover with wax paper. Microwave at medium high (70%) 8 minutes. Remove wax paper. Microwave at medium high (70%) until wooden pick inserted in center comes out clean, 8 to 10 minutes. Repeat with remaining ingredients in another 8 inch square baking dish.