So after some pondering I replaced my 9018 board with the 9038. I already had the Mercury. It was a matter of changing the 4 resistors.

With the 9018 I could listen to DSD thru the JLSounds i2soverusb card and Audirvana Studio
in my computer.

But I have not been able to make it function with DSD. There is very loud intermittent swoshing sound every 5 seconds or so. There is music reproduction btw. I ordered some ufl cables to see if connecting the 2 boards with these the issue is resolved. The connections between both boards are exactly the same as with the 9018. I’ve read about the issue here and in Diy audio without any clear explanation to me. Once the topic of the SW 2 and the switch positions come on, I get lost, b1110 d16, etc. Don’t understand that.
If someone has solved the DSD issue here with the 9038 I would appreciate a pointer. Thanks!