#1 - No they're different.
#2 - There may be. USDM WRX users who have 02-late 03 models have reported several strange combinations of front and rear pads in their cars, as done by SOA (Subaru of America). Apparently.....to make a long story short, some 02-03 USDM cars have different combinations of front and rear pads. So be wary.