1. Output Voltage Adjustability: The RSP-75-15 features an "Adjustable Output" function, allowing its output voltage to be fine-tuned within a certain range (e.g., ±10%) via an external resistor or potentiometer. This accommodates more precise system voltage requirements or compensates for line drops. The LMF75-20B15-C offers fixed output, providing less flexibility. 2. Product Series and Design Philosophy: The two belong to different manufacturers' core series (LMF75 vs. RSP-75). While their key performance parameters are consistent, differences exist in internal topology, component selection, testing standards, and reliability design philosophy. The RSP-75 series is generally regarded as an industrial standard, with broader market validation and supply chain support. 3. Cost and Value: The RSP-75-15 carries a significantly higher price than the LMF75-20B15-C (approximately 86% premium). This price difference reflects both the added value of the adjustable output feature and factors such as brand premium, differing warranty policies, or long-term reliability data. In applications where voltage fine-tuning is unnecessary, this premium may not yield direct benefits.