All these different terms can become confusing. Some think they can be used interchangeable. However the blog below will help you understand the difference.
Value stream management goes beyond DevOps and Agile and is a holistic concept that helps accelerate value delivery. It always follows the following simple steps:
Value Stream Mapping is a manufacturing process used by companies like Toyota. It is also known as "material- and information-flow mapping". A lean management method that analysis the current state and defines the future state. A process improvement tool.