The bulkhead is actually moved and re-profiled. There's little enough difference at the bottom but there is something close to 4ins at shoulder height. You can see the rivet lines on the outside of the aircraft. Coupled with the more reclined position, there is the distinct impression of more room in the cabin. It's quite noticeable if you jump out of the Elite and into an earlier "standard" Power.
It is only a cosmetic exercise compared to the later Grand which has a definite plug in the hull to extend the overall length.