The crank pulleys should be exactly the same. I have both an auto (4EAT) and a manual (5MT) 22E engine and they appear to be the same part. However, the Subaru factory service manual does give two part numbers, one for the 4EAT and one for the 5MT.
That being said, I would just buy whichever model you can find. Keep in mind that they are also listed as harmonic balancers. Rockauto.com has the Dorman for $33.79. There are manufacturers that sell lightened crank pulleys that fit both models so you can just get the Dorman and install it.
By the way, you didn't specify if your vehicle is a manual or auto. Also, the first gen forum is not as great in numbers as other forums so you have to be patient for advice.
If you want to learn more than you can ever care to learn about first gen legacies, check out legacycentralbbs: http://bbs.legacycentral.org/index.php
It is hands downs the best site for first gens. Good luck!