Not similar at all

like dark chocolate versus black licorice
my criteria is seasonality (dependent on geography) and style French (structured) /Italian (fluid)
dark ebene (can be summer ) with taupe, white;
can be sartorial with blue, green, and other colors (in my world, navy is a pop of color)
my test is: ebene is better when worn with Italian designers like brunello cuchinelli, etro, borelli tailored shirts (or any tailored shirt. exception: Gucci and Prada RTW is best with black.
black (can be year round if you live in North America, but is really more fall, winter in other places). Not as good in Asia, or southern US (JMO), but if I am traveling there, I don’t bring multiple bags so would probably pick a light neutral etoupe/ etain.
black is mainly fashion (I think some would argue black is never sartorial)
my test is: balck is better with french designer chanel, Dior, anne Fontaine, and better with non Italian designers like Jil sander, Akris, and Issey Miyake. Exceptiom: Marni and Louis Vuitton RTW (I haven’t bought any of the latter since Marc Jacobs, so I have no idea)
This presumes you are like me and prefer not to match RTW brand to bag brand.
Note: for sartorial clothing, I prefer pebbled leather
for fashion clothing, I prefer smooth heritage saddle leather
IDK why, but it fits your hypothetical between black box and ebene togo
arguably, for the right bag, the right shade of blue could be both sartorial and fashion and be acceptable in all seasons, but we are not exactly minimalists on TPF