[Mod Continuity difference Power / Duration]

Ok perfect thanks guy's 

[Mod Continuity difference Power / Duration]

I was just looking on warframe market for an Continuity Mod (ability duration). 

But when i search i find the exactly same called Continuity but saying Power duration and not Ability. Why there is no listening with ability duration?  Have they changed the names or what is the difference? They have same name. As i am really new to the game i couldn't find out about this