If you don't find a patch that matches your postfix's version, try an older one, for instance, the 1.1.8 patches cleanly on a 2.0.7 :), but you should use the one for 2.0.0.2 anyway if you read what I wrote just before :)
postfix 2.0.0.2 :
postfix-pg.postfix-2.0.0.2.patch
postfix 1.1.8 :
postfix-pg.postfix-1.1.8.patch
snapshot 20020115 :
postfix-pg.snapshot-20020115.patch
postfix 1.1.4 :
postfix-pg.postfix-1.1.4.patch
snapshot 20011210 :
postfix-pg.snapshot-20011210.patch
snapshot 20010329 :
postfix-pg.snapshot-20010329.patch
snapshot 20010228 :
postfix-pg.snapshot-20010228.patch
postfix 20010228 pl01 :
postfix-pg.postfix-20010228-pl01.patch
release 20010228 :
postfix-pg.release-20010228.patch
snapshot 20001005 :
postfix-pg.20001005.patch
snapshot 20000531 :
postfix-pg.20000531.patch