Comparing the power subsystem from the SR1690WB from Intel� Server Board S5500WB — Technical product specification (TPS) and the power subsystem for the SR1560SF from Intel� Server Board S5400SF — Technical product specification , it looks like the board may pull more amps on the +5V and +12V V1 and V2 rails than the 1560 can provide.
I would not recommend using the 1560 power supply in place of the 1690.