if I am not mistaken your screenshot shows +0.49,-0.49 vs 0.49, 0.49...
You're correct, my bad (and ignore RGB, I just typed your Lab values, incorrectly into the sRGB color list).
So now I see a
whopping 1.7 dE:
But you are correct, at that value, using dE 2000 and 1.0 as the granularity of perception, it
could be noticed.
The sRGB examples I provided, no, those two device values are one color.
Sufficiently big dE-whatever?