88-92 have different higher end interiors and leather instead of vinyl door panels. 93-2003 don't seem to have differences besides the wood steering wheel (and tables of course) am I right?

 

LWB standard (except for the 1995MY and 2004MY)
Veneer trim inlays and interior trim like piping in the leather.
Many convenience features like passenger front seat controls accessible to the rear seat passengers.
Exterior trim like fluted grills, boot lid trim and badges and special wheels.

I can't even remember all the things that are available on the VDP cars!!!!!!!!!!!!!!

 

The older vanden plas models have a more clear distinction. Shame really.

 

You can check old sales brochures in a couple of places:

Auto-Brochures.com|Jaguar Car PDF Sales Brochure/Catalog/Flyer/Info E-Pace F-Pace I-Pace E-Type F-Type S-Type X-Type XE XF XJ XJS XK
Jag-lovers brochures - XJ Index

Those should call out most of the detail differences. On my 2008 it mostly consists of including most options as standard. The "business trays" and bright finish on the mirrors, fender vents, and lower grille are the main visual distinctions, also shared with the Super V8.

Dave