What is the difference r414b and r409 freon?

R-414B and R-409A are both refrigerant blends, but they have different compositions and applications. R-414B is a blend of R-125, R-134a, and R-600a, designed as a replacement for R-12 in low-temperature applications, while R-409A is a mixture of R-22, R-124, and R-142b, primarily used as a drop-in replacement for R-12 in medium-temperature refrigeration systems. The differing compositions lead to variations in thermodynamic properties, efficiency, and environmental impact. Additionally, R-414B has a lower global warming potential compared to R-409A.