The consent module is split into two subsets - Candidates and Contacts. This is to allow you to have a different configuration, retention period and exclusions between the record types and ultimately manage your data differently based on the type of people.
Both option can be found within Admin - Consent and the configuration options are largely the same. However, as contacts don't have a portal interface in the way that candidates do, the email communication and preferences become even more important in ensuring you are not storing data you don't need.
Hint - As both modules work independently, there is no obligation to use both. If all of your contacts are your employees, you may not need to use the contact consent module at all.