Does Orochimaru know all his jutsu that he learned after he gave Anko the curse mark and was revived from it? A portion of Orochimaru's consciousness was in Anko's curse mark, so he could see what she saw, but is this linked with his other consciousness? So that if the real Orochimaru thinks he learns a jutsu, does the Orochimaru in Anko learn it too? Is there any canon explanation?
He didn't necessarily know all of the techniques the original had learnt.

But even if he didn't, the moment he absorbed his power back from Kabuto, he relearned everything (since the cells in Kabuto were from the time Sasuke "killed" him).