How easily can you distinguish between different DACs?

@ invalid, 

I offer you should rethink your chip vs discrete preamp blanket bias. It was very true back in the days of TLO72's.  By the time of the NE5558 ( POOGE, biased into class A) it got a lot fuzzier. With modern OPA series chips, it comes down to execution.  Just picking OP-Amp vs. discrete is no guarantee the discrete was well executed either. Some can be of course. So "it depends".  An inherent advantage of discrete is higher current so the possibility of cable impedance matching at the load end may have some possibilities.  Paralleling op-amps can do the same thing. 

invalid

... just choose the DAC that has the output stage built on the chip because it measures great, would you buy a preamp that uses an opamp output stage because it measures better than a discreet output stage?

Many fine preamplifiers use opamps. For example, it’s how Audio Research configures its balanced differential preamps. Fully discrete. I don’t understand the prejudice against them just because they’ve sometimes been badly implemented in ICs. You could say that about virtually any audio circuit.

@audiowebe  Yes - the N200 made an audible difference, a little cleaner, a little more solid.  Particular improvement in Hi-Res (with regard to sampling rate) content for some reason. I also noticed a big jump in the playback quality of my ripped CDs - best I have ever heard them, and I did own the last of the top-end OPPO players.  The minor downside to the Aurender for me has been the UI.  It is not as feature rich as Roon and does not offer a PC-based platform.  That said, the UI (Conductor) is super-reliable and supported by real people who actually respond to your questions promptly - you are never lost in a crowd-sourced feedback morass.  There is talk of Aurender being a Roon endpoint soon, but I do not know how much of the Aurender sound quality advantage will be lost by operating in that mode.  Sorry - I went off for a while there. 

I've owned the following DACs - Audio Note 1,1, Blue Circle 509, April Music Stello MK2, Aqua LaVoce S3, Modwright Elysee, and MojoAudio Mystique V3, none sound the same,  and it was easily discernible 

One more point to add about the Aurender N200 as a source and what it brings to the table (I assume most mid-high and above server streamers would do the same to a similar extent).  In my response above I said "a little cleaner, a little more solid" and I'd forgotten about the subtle but very satisfying sound layer reveals that have come with the N200 replacing my PC running Roon.  A good example is the Local Hero Soundtrack (Mark Knopfler).  The very first track - The Rocks and the Water - used to be somewhat of a throwaway for me - but with the Aurender the sonic subtleties coming from the various blended synth effects is like listening to the quiet in nature - at first you hear nothing, then the sounds build in and around each other.  This is an extreme example - I am not trying to say it makes all music sound stupendous - but it certainly reveals subtleties in a very pleasing way.