Standardizing through SMPTE is a 2-way street so they are pretty much one and the same now just like DNxHD is VC-3. Avid could have just added to DNxHD but that would've meant no longer being VC-3 compliant so you get DNxHR. It's the same with Cineform, it can change but then it won't be able to claim VC-5 compliance. The only real difference at the moment is VC-5 does not allow for interlaced encoding which is why it's being deprecated by Cineform, to maintain compliance.
If and when I can confirm that this:
http://ieeexplore.ieee.org/xpl/artic...Number:7290349)
really does include the reference code and test materials I'll seriously consider getting it. It's $120.00 US for non IEEE members which isn't too outrageous