This cheat command sets the culture of the specified province to the primary culture of the country you are playing as.
culture [province id]
| Province ID | The ID of the province you wish to change the culture of. |
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culture 7
Skaraborg's province ID is 7. This command would set the culture of Skaraborg to that of the country you are currently playing as.
culture 33
Neva's province ID is 7. This command would set the culture of the Neva to your country's primary culture. See here for province IDs.