That's what the term "parts bin parts" refers to in the industry. If you get familiar with any car brand you can normally tell what brand of car a particular switch came from because they all use the same parts. Corvettes will share a LOT of parts with Suburbans, eg.

You still have the issue of having to build the panels that the switches get installed into, so if you can replace a bunch of switches with a touchscreen interface, you can get on with designing the interior before you even know how may switches need to be installed.