They should just pop off using a putty knife or flat head screwdriver. Just carefully work around the hub and it will pop off. Don't loose the pin that goes through the shaft and holds the hub in place once the hub pops off.
Do all 3.3's have 17mm hubs? Do all 2.5's have 14mm hubs? I have a 2.5r with 14mm hubs...I'm looking at some tires/rims that are only described as "off a 3.3"...