Change driver of network printer on local machine?

We have a bunch of computers in the office which connect to a Win2003SBS.

We have two Brother laser printers on our network.

Is it possible for my computer to use a different printer driver for one of
the printers or would I need our network consultant to login to the server
and change the driver?

The reason I ask is because there's two types of drivers.. PCL and
BR-SCRIPT. The PCL offers more features. I'd like to start taking advantage
of them.

One of the features is a macro feature, which can store stuff in the printer
memory, such as a letterhead you use often, so when you print something on
the letterhead it'll print faster because that portion of your document is
already in memory.