I can't help with identifying where they are from, I'm afraid.
As far as I have ever found, though, it is those two videos, and the official set of bloopers on the Season 1 DVD that are all of the outtakes from the whole show that are out there in public.
The first video you posted has a lot of later-season bloopers, and in places appears to be from different original sources (see the transition at 0:40). You can also notice the timecode from the original footage showing up at the bottom of some of the clips, perhaps suggesting they were extracted from the 'rushes'/'dailies' (see here
(By the way, Gill, I edited your post to fix the YouTube links. They weren't showing up for me before. I think you have to only include the code that comes after v= in the URL, not the whole URL!)