Kry should be the one answering to that, but he's been out of forums for some days now, so i'll give you my five cents untill he comes along and tells the whole truth of it hehe.
In network code, it's up to eMule 0.43b, except for the kademlia implementation which is work in progress still.
IN features, it is not comparable to eMule since it lacks some of eMule's features but has some which eMule lacks too. Some of those features aMule lacks from eMule are not going to be implemented ever since they are considered a focus of security issues (as they are being on eMule), as an example, IRC implementation and mailing service and such.
aMule has a very friendly and close relation ship with eMule and their code are as similar as developers can make it. aMule implements as mcuh eMule code as possible to keep it being a real multiplatform-eMule.
As a sum up, if you know aMule's code, except for some files, you can easily handle eMule's code, and same the other way round ;-)
Greetings!
