vl-vs paint is all much the same, clear coat fades and looks crap so no change there, although the odd 1 did escape the factory and still looks mint.
performance, some changes in the memcal as they ironed out some bugs and made small changes could go better or maybe tamer... same engines, cam, trans etc etc.
vp looks like a vp, 20 year old car, no guarantee it'll be 100% stock it may have had a grill replaced in it's life, but basically not a lot of difference in looks, main differences were simply cosmetic depending on what level the car was, exec, berlina, calais etc etc.
interior, same as the outside cosmetics.