they will likely be the same. as far as back space goes, in short, a larger measurment will be how far the wheel has the sucked in look and a shallower measurement will be how far it is to the fender lip. you gotta know it or else you'll get wheels that hit something on the inside or vice versa.
to find the back space take a straight edge and lay in across the back of the rim and measure up from the center of hub. look for 3-4 inches to be safe.