Yes, the individual keys on the Skiller Mech SGK3 from Sharkoon can be exchanged.

### Interchangeability of the keys
- The keyboard uses mechanical switches from Kailh (in the case of the model with the ID 4044951019939, these are Kailh Brown switches), and the keycaps are interchangeable.

### Compatible replacement keys
- To ensure that the replacement buttons are compatible, they should be suitable for Kailh Brown switches.
- It is advisable to use PBT keycaps as they are durable and robust, which is also supported by the original keyboard.

### Additional notes
- The keyboard comes with a PBT keycap set included, which already provides compatible keycaps.
- If required, additional PBT keycaps can be purchased from Sharkoon or other manufacturers that support Kailh Brown switches.