Other than the fact that they involved the He tanks, there weren't many similarities between the events.

With CRS-7, there was acoustic evidence of the strut failing and the COPV smacking into the tank wall. With AMOS-6, the first indication of any event was the catastrophic failure of the COPV.

In either case, the location of the He tank isn't terribly relevant... It was going to destroy the rocket either way.