Hi Ken,
No, AB168 is working with 48kHz, the DX boxes with 96kHz. You can´t daisychain two boxes with different sample rates. You could however buy the optional SLink card and have the internal SLink port work with the AB168 and the additional SLink card with the DX168. The sample rate conversion is done in the cards.
But you would have to buy another Cat5e cable…