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RX LOs  independent? How many bits in ADC?

Are the LOs independent in each RX channel of AD9371?
How many bits in the ADC? How does internal ADC compare to stand alone ADC AD9863BCPZ, 14b 250Msps?
In RX only application, are AD9371 and AD9375 the same?

We have a radio from 20M to 18G; we down-convert to IF centered  <200M to digitize with AD9863, clock > 250M. I am considering the zero IF approach; down convert to  nominal 1G IF.