Late Model Zephyr vs Late Model Super 20

[CosmicGrooves]

What are the main differences in these horns? Besides the Silversonic they look almost the same. I know the Super 20 has the engraved keys whereas my Zephyr does not, but what else? I'm starting to think that the late Zephyr and Super 20's are the same horn just one comes with, in car terms, leather interior and sun roof when the other is regular.

My Zephyr

[NissanVintageSax]

The bell keys are also "Selmer" style as is the Bb table (sans the rocker). Other than that, the body tubes are the same. I think the neck may be different, but I have nothing to back that up (the neck difference I mean).

[CosmicGrooves]

Hmm.. that makes it sound much different that I thought.