If you're collector - you should buy them. And maybe there would be some differences, for instance 'Breakthru' from GVH2 is a slightly different to 'Breakthru' from GF2. 'Las Palabras De Amor' from GF3 is in shortened version if compares with GVH2's one, etc. etc. etc.
Answering the question: no, not all the videos, most of the videos from GF2 is on GVH2 already.