It is not safe to interchange oxygen and fuel gas hoses. These hoses are designed specifically for their respective gases, and interchanging them poses serious risks such as fire, explosion, hose failure, and health hazards. Oxygen hoses are typically made to resist oxidation and withstand high- pressure oxygen, while fuel gas hoses are designed to handle combustible gases and resist chemical degradation. Using the wrong hose can lead to dangerous gas leaks, contamination, or catastrophic accidents.