Not really a 'vs' clip, more of a 'showing how the systems operate' clip.
It's also the latest systems, not the traditional ones.
So it's the new A4 Allroad system without the Torsen differential and with the electronically activated clutches which can completely disengage the rear diff.
And the 4Matic is the version found in the CLA - Transverse engine, DCT trannie and fancy new rear diff.