Final answer:
Two data flow diagrams with equivalent external data flows are described as being balanced, showcasing structural equivalence regarding their external interactions.
Step-by-step explanation:
When two data flow diagrams (DFDs) have equivalent external data flows, the correct term to describe their relationship is balanced. This means that the two diagrams are structurally equivalent regarding the inputs and outputs that interact with external entities. While they might have different internal processes or data stores, it's essential for DFDs that describe the same part of a system to have external data flows that match up in terms of data and data volume. This ensures that both diagrams can be accurately compared and understood in the context of the system's overall data flow.
When two data flow diagrams (DFDs) have equivalent external data flows, we say that the two data flow diagrams are similar. This means that the external data inputs and outputs in both DFDs are the same, indicating a similar flow of information in the system.