1c0959799b is the part number for hardware only.
You should get a matching colour code (three characters) as this will contain the correct software, you will need to read this with diagnostics as it’s not printed on the box (unless ordered for a specific car as a spare from VW).
There are over 100 colour codes for Golf hatch, estate, Bora, Octavia (both sedan and estate), Passat, etc as well as options fitted on car (horn or battery backed up horn, number of doors, etc).