IIRC the Elan package is basically the Spoiler package, but with a pan control instead of a pickup selector. Either package would be a custom order these days, as they are not offered as a standard option on any model. The closest current package would be the Essence with an added Q switch.
Anyway, don't expect a different sound based on the electronics ... A standard Elan would have a maple body, a standard Spoiler would have a mahogany body, and IMO that would be the most significant factor in how they would sound different.