Yes it's R2R. Differences are thicker faceplate, upgrade IC sockets, AC filter, Copper chassis, two superclocks, KR rectifier, Mundorf caps in power supply and output, upgrade footers, flight case, etc.
Sound? More liquid, lit from within than other DAC's I've owned. Texture, tonality and 3D are all noticeably better than my previous situations. All my perspective of course, it's a total keeper!