How does a customer journey map differ from a service blueprint?

A customer journey map offers more information on the internal processes and support systems that deliver the service to the customers more than the experience of the customer provides a more detailed look at the service delivery process across the different touchpoints.

A service blueprint offered detailed information on customer personas and lifecycle stages.

There is no difference between the two $-$ they are simply two names for the same technique.

A customer journey map focuses more on the surface customer experience and reveals less service process details.