the connectors layout is indeed identical, the rest looks different i guess, but the sticker is screaming "we are brothers!" (amazon to the right)This is built from a standard motherboard that has been circulated on eBay and elsewhere in myriad conformations for a few years—I’m pretty sure it’s the same internals KanexPro uses for their HAECOAX model, but this iteration is at a much lower price.
I’m not sure why you have to select the multichannel toggle to get high sampling rate passthrough to coax, but you do. I use the KanexPro version to output from the HDMI Audio Out on my (discontinued) Sony UBP-x1000ES Blu ray/SACD player, running to the digital coax input on my Topping d90SE.
When I have the multichannel output selected on this board and Sony’s DSEE Extreme enabled on the player, I get 88.2khz for Red Book CDs and 176.4khz for SACD discs—this is how I figured out that the DSEE Extreme engine upsamples the signal by a factor of two. The same tech is still available in the current production UBP-x8002–whether the upsampling makes any audible difference is questionable, but to my ears this setup sounds great!