Question about Ken Perman DVD's?

What's the difference between Ken Perman's DVD's:

1) "Clawhammer Style Banjo: A Complete Guide For Beginning and Advanced Banjo Players, Vol. 1 & 2"

2) "Beginning Clawhammer Banjo" 

3) "Intermediate Clawhammer Banjo"

Are the last two DVD's the same as what is on the first?  

I have his book and would like to check out his DVD's.

Thanks much!