Ray's layout is very different from Justin's from a technical perspective but I agree, visually they are strikingly similar. Rays DAC is basically a Bithead, Justin's is more along the lines of the Ultra Micro DAC - to make a comparison to existing products. Rays amp section is just a detuned Hornet (same layout, different opamps), I don't know enough about the Pico to speak about its amplification section.