Sorry, if you do it sighted, that is, you know which one you are listening to, it doesn't matter what you think, and I am more or less (just not the exact words) quoting Dr. Toole.
But, if you think so, that's great news regardless! That's assuming you compared them under the exact same conditions and switched between them without even a few seconds of delay, others there are just too many factors anyway that has more audible effects than the different DAC ICs. The preamp really is just the volume ICs that are identical so no impact.
Remember the previously posted block diagrams:
View attachment 415217
The following slide in the Masimo presentation shows the "common technology" used in both, that confirmed 100% the preamp/vol ICs and switches used are the same.
View attachment 415218
I won't rule out if you have very discerning hearing, you may be able to hear the differences due to the better build quality of the 6800 that likely result in measurably better SNR, DR, SINAD, cross talks, IMD etc., just that results done without DBT or at least SBT, level matched to within 1 dB or better, and other controls won't be reliable.
The DAC IC difference in specs and their implementation between the two are indeed significant, there is no doubt about that, the only question is, how audible the resulting difference would b? I don't think anyone knows the answer, but all can, and some have, speculated.