How about the Subaru Part numbers:
04-05 EJ25 Dipstick: 11140AA120
06-07 EJ25 Dipstick: 11140AA150
WRX EJ20 Dipstick: 11140AA046
If you do a search you'll find a post somewhere on here (or another forum?) where there's pictures of all the dipsticks and gude tubes. There are differences.
On the pans though, the tubes (the part welded to the pans) are the same.