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I split this into a new thread to make the subject match your question better.
The key additional feature of the TSW12J54EVM is the active differential front end. If your application needs signal gain, or DC coupling, then this board may be a better choice. It can be used with single ended or differential input signals, and can be operated in AC-coupled or DC-coupled configurations. Signal frequencies from 0 Hz to just above 2 GHz can be used.
The ADC12J4000EVM comes configured with a single ended input using an on-board balun transformer to convert this to differential signals AC-coupled to the ADC inputs. The board can be re-configured to allow differential inputs, but is most easily operated in AC-coupled mode with this configuration. If a DC-coupled differential drive is desired the external differential driver must match the common mode voltage (Vcmo) of the ADC inputs.
It is possible to reconfigure the board to allow it to be synchronized to an external clock source, with just one clock signal being applied to the board. If you apply a 100 MHz signal to the OSCin connector, and reconfigure the board to use that as the TRF3765 reference input (instead of the on-board XO) then it can generate a 4 GHz sample clock that is synchronized to your external circuitry. To enable those mode of operation, just remove R38 from the board, install R30 (49.9 ohms, 0402) and remove the shorting jack at J2. You can use the on-board clocking settings to select the desired sample clock frequency.
You can alternatively drive in 4 GHz on the EXT_VCO connector, but you'll need to change the TRF3765 configuration settings to enable that mode of operation.
I hope this is helpful.