What you a describing is termed "shared design elements". Manufacturers use them to bridge consistency in their products to either establish continuity between products in a series or allow consumers to quickly identify product belonging to XYZ company without overly used logos or slapping their name across everything.
The automobile industry is a prime example. For instance, all model year vehicles produced by Mopar (Chrysler, Dodge, Plymouth) will share design elements within their respective brands such as headlight or tail-light shapes, grill shapes and patterns, body mold lines, etc.
Look at a Jeep. Every Jeep from the original Willy's to the newest SUV has a similar front end with a grill created by seven vertical lines and bracketed by two headlights and subset driving light/turn signal. It's as iconic as a T-visor, for the same reason: it quickly identifies what it is and where it came from.
Look at canon images of anything made by Corellian Engineering Corporation. Most all have a rotating cockpit with bubble canopy and/or modular fuselage with similar side-stationed docking rings. These design elements quickly allow us to recognize, without being told, where this ship comes from and probable history.
Mando Motors probably does the same thing, so it would not be a stretch of the imagination to include an element such as the keyslots or even the iron heart chest diamond into other aspects of the armor. Canon Mandalorian references to vehicles and civilian attire already adopt some of these.
This is the Way.
