Not really. Tire models aren't quite as cut and dry as that. Everything (especially tires) is subject to garbage-in/garbage-out to an extent. The model could be perfect, but the stiffnesses or load sensitivity or anything else could still be a little too far off just because of the input data you used in an attempt at recreating a particular tire. A set of tires on one car is bound to be closer to the real set than it is on another. There's always room for a little bit of improvement on any given car or tire, so I take the updates to tires on various cars as a good thing. It means they're paying attention.
The split between front and rear tires on a particular car is especially critical. Changing the grip or lateral stiffness on one end or the other by only 1% can have a noticeable effect.