The Gary Moore sound is a simple pitch-down of a single (rich) synth patch. There are no rising harmonics in it. Further, it wasn't actually released until '83 at the earliest.
The Deep Note uses a whole bunch of cello patches, each following its own pitch envelope, and resolving on the final 5th. IIRC Moorer generated a large number of versions to demo (as it used a random initial starting sound) and the winning version just happened to have a bunch of voices start on a similar pitch shifting down.
The Gary Moore sound is a simple pitch-down of a single (rich) synth patch. There are no rising harmonics in it. Further, it wasn't actually released until '83 at the earliest.
The Deep Note uses a whole bunch of cello patches, each following its own pitch envelope, and resolving on the final 5th. IIRC Moorer generated a large number of versions to demo (as it used a random initial starting sound) and the winning version just happened to have a bunch of voices start on a similar pitch shifting down.