Nmbrs® HR and Nmbrs® Payroll user accounts are not connected in any way. Access is managed separately in both apps. The access to our payroll product will not be effected if your Nmbrs® HR user also has a user account in our payroll product.
The only thing to take into consideration is the data visible on the personal app pages. For example, the app page for Nmbrs® Payroll contains salary and sickness details.