I have no idea in all honesty - I'd guess that the model year is probably more important than the plate but all things being equal then holding off for a couple of weeks would seem like the sensible thing to do. Will need to start paying more attention to the shipping info thread to see when the next potential batch would be although I'm sure there would be a lot of competition for the ones in early March... dunno
My first Tesla so I'm a bit clueless about their process - I'm assuming that, if I was given a pick-up date of the 21st Feb for example, there isn't the option to ask them to hold onto it for a few days until March?