Like the other response said...they are the same mechanically; The difference isin the "add-ons". Such as burled wood trim, tray tables in the back, reading lights in the back, hood ornaments are sometimes different, nicer wheels, etc.
We are stopped or asked about ours every time we drive it. It is a head turner. We recently went on Vacation in it and were stopped by people in Santa Fe, Lubbock, Clovis, and Pecos who just wanted to see it or just say "very nice car". I was stopped by a local police officer in Texico ( border of Texas and New Mexico) who "thought our rear brake light wasn't working"...yet as we stopped he said he realized that in fact it was and he was sorry for the trouble... and "Oh, by the way that is the nicest Jag I have ever seen". Good luck with the Vanden Plas. StevenA