Sure, Eddie, the same crossover that you set in your receiver would have to apply to both subs since they're both receiving the same signal from the sub out(bypass the sub's internal crossover if it has that option; if not, turn it to the highest setting to get it as far away from interfering with the receiver's crossover as possible). The crossover frequency is of far more significance to the speakers than the sub anyway.
Although the subs receive the same signals, different efficiency and room placement might lead to different sound levels. The subs should be calibrated separately and the levels balanced by using the level adjustment on the back of the subs.
The best placement to help minimize the effect of room modes would be at the midway point of the opposite side walls(or the front and back wall).
Different subs aren't the ideal arrangement, but you should certainly use both if they're available and see how you like the effect.
