Yes, the frame size of the NSX 250A , 160A & 100A is the same size dimensionally, providing the number of poles is the same.
And the Dimentions W X H X D for a 2/3P are 105 X 161 X 86 mm and for 4P are 140 X 161 X 86 mm.
And the Dimentions W X H X D for a 2/3P are 105 X 161 X 86 mm and for 4P are 140 X 161 X 86 mm.