I think you’ve got your models mixed up or I’ve got the colour names mixed up.
To clarify ….
Apple iPhone 5 released with this black colour:
m.gsmarena.com
First 2 pics attached. At least in North America.
The iPhone 5S released with this 2-tone shade of black colour which the middle back of the iPhone 5S matched with the sides of the iPhone 5S (the 5 sides were black I believe).
m.gsmarena.com
Last attached 2 pics.
Note that the SE came with even more muted or matte sizes and back. Unless of course I’m mistaken or misunderstanding and GSMArena is incorrect (which in 19yrs hasn’t been).
Still a solid phone for either and I’ve owned both within weeks at launch, and several times thereafter - probably THE most repeatable iPhone I’ve ever owned due tot he cheap price (aftermarket as well) and incredible iOS support.
A follow up post to come.