You can duplicate KeypadController & Keypad Models
You can increment the number once duplicated yourself and you just want to check that each of the inspector slots has the corresponding elements in the hierarchy, to what you just duplicated.
For example: If you select the KeyPadController#2 but make sure you organise everything correctly and all your gameobject link to the correct objects themselves, this is why it’s good to organise everything into one empty gameobject. Check out the demo scene for more tips