Employee management software organizes people processes inside an employer: employee records, reporting relationships, requests, job changes, and assigned work. Freelancer accounting software organizes the finances of an independent business: clients, invoices, expenses, payments, and related reports. Both may store names and amounts, but they describe different relationships.
An independent designer uses a client record to bill a customer, not to manage that customer as an employee. If the designer later hires staff, the business may need employee services as well as its existing financial records. The two categories can therefore be complementary, and some products offer additional modules or integrations that overlap.