Can DDC of another brand be used on Denafrips Dac?Audio GD etc

A further thought.  My audio pal just got the Berkeley DDC unit and I will be keen to compare how my $500 device compares to his $2500 unit.  I imagine all these DDC devices have a high degree of efficacy. 

Gents,

Thanks for the responses. 

The I2S connection that the La Voce has is compatible with other Aqua gear, but not with many others.  I connected the U18 via an AES EBU cord and I can say that it is plug and play with my iMac as the source.  It has been playing for a couple of days and I am prepared to say that it might well be the best $500 I have spent on a component is a long time, right up there with my Oppo 103.  I have Don Sachs new preamp and his 300b mono blocks driving Cube Audio Jazzon speakers and the SQ is stunning and yet improved with the addition of the Gustard unit.