I believe they are in the same hole and the same servo horn angle. They have provided the LHS servo lower and the RHS servo higher so that the arms with opposite orientations lead to both the pushrods being at the same height from the bottom of the fuse. However, I dont know what horn they used for reference because ther rods arent the same height from the fuse bottom in my case. I am using the stock Hitec plastic one side horn. Its in the correct neutral, at 90 deh to the servo centreline. I know because I tried both the neighbouring positions and they arent 90 deg

Ameyam