I have a Space Black Titanium S6 and my wife has a Space Black Hermes S6. The Hermes does have “Hermes” etched on the underside of the Watch but other than that and some exclusive Watch faces, it’s the same as the stainless steel version. However, you can’t get the S6 stainless in space black anymore. Only the Hermes comes in space black, otherwise it’s graphite, gold or silver on the standard stainless.
For Hermes, you’re paying the premium mainly for the leather (band) so ditching the bands would pretty much remove the Hermesness. Proof of that is the Hermes Air Tag holders. The Hermes bands do fetch a good resale.
The Titanium comes in Space black which is DLC and natural Titanium color closer to a gray champagne. My Space Black is very durable and not prone to scratching at all.