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ADC3663: Effect of swapping P and N at inputs of ADC

Part Number: ADC3663

I have 2 differential amplifiers giving same output signal. To rout analog inputs without vias i need to connect the input channels as in image. The differential input varies from 1.2 to -1.2V.

Is below one the effect of this connection? 

     1. if 1.2V output of Diff amp_1 give 0xE000 at ADCchannel A, 1.2V from Diff amp_2 give 0x2000 at ADCchannel B

     2. Is there anything else to consider on HW design?