For those of you interested, it seems like this version of the saga is not the same as the one aired i 1977. It's missing about 5 minutes and it's a combination of the saga and the trilogy version.
I found a good page illuminating the different versions, and this was said about the 2012 AMC version:
To celebrate the 40th anniversary of The Godfather films, AMC airs their version of The Saga. The AMC Cut is notable for being the first time any of the chronological edits have appeared in a widescreen format. It was also broadcast in HD, another first.
In 2008, while sourcing footage for the Coppola Restoration, Dreamworks came across a pristine copy of the original 1977 NBC print for The Godfather Saga. This was then matted to a widescreen ratio and the footage was synched up with the 2.0 Stereo mix from The Trilogy². (For scenes that were in the Saga but not the Trilogy², the soundtrack reverts back to its original mono). Some of the scenes that were unique to the Trilogy² were also flown in for this cut.
While this cut, on the surface, appears to be the ultimate merging of The Saga and The Trilogy, it suffers from several minor trims and lifts throughout. A line of dialogue here, a minor scene there, etc, all add up to make a cut that is almost five minutes shorter than the original Saga, despite having the extra scenes from The Trilogy²! Some of the scenes that were exclusive to the original airing of The Saga are missing, like Michael asking Santino Jr. how his book is coming along.
Overall, it was great to finally see (most) of the original Saga in a cleaner format, but thankfully we held on to our 35 year old Betamax recording of the initial airing.
Read more about it here:
http://godfathermuseum.blogspot.com/