Not exactly.
Wikileaks is a foundation that anyone can use to leak documents that might be in the public interest.
Guccifer 2.0 is supposed to be an individual Tomanian hacker that obtained the documents and turned them over to Wikileaks.
The most recent twist is that Guccifer 2.0 doesn’t appear to actually speak Romanian and is suspected to be a Russian front for their Intelligence operations.
Zero Hedge had a transcript of an interview with Guccifer 2.0 saying he was Romaaian, and in the transcript it says the he spoke Romananian to the interview person to prove he was Romanian. The article was on FR a couple of days ago.