There's a bit of a misunderstanding in the question. "Clostridium gas gangrene" and "perfringens" are essentially referring to the same thing. Let's break it down:

Clostridium perfringens: This is the name of the bacterial species responsible for gas gangrene.

Gas gangrene: This is the disease caused by the bacteria *Clostridium perfringens*. It's a serious, potentially life-threatening infection that occurs when *C. perfringens* bacteria enter the body, usually through a wound.

Therefore, there's no difference between "clostridium gas gangrene" and "perfringens". The former is simply describing the disease caused by the latter.

Here's a breakdown of the relationship:

* Bacteria: *Clostridium perfringens*

* Disease: Gas Gangrene

It's important to note that *C. perfringens* can also cause other illnesses, including food poisoning. However, the term "gas gangrene" is specifically used to describe the serious infection caused by this bacterium.