A journey map is used to help us understand a user story from a customer's perspective. A customer journey map is a process the customer follows or workflow steps looking for improvements in the overall experience. The journey map typically reflects several user stories. Mental state and emotions are aligned with the process in a journey map where they generally are not included in individual user stories. The journey map shows the process and identifies steps in the process that are breaking down. It's used for customer experience improvement and process improvement.
A user story is a stakeholder requirement. It contains the role, goal, and motivation related to a product or service. Example: As a, I need, so that. User stories are looking at components of the overall customer journey.