These are the two definitions I was taught on the subject.
Picking - Diving in on an already engaged enemy. IE clearing 6.
Cherry Picking - Diving in on low E enemy aircraft that are fresh up from a base.
see, i agree theres a difference, but i'd call your "cherry picking", "vulching"
and i'm sure there are people who say it's not vulching unless the wheels are on the ground..
i think one common thing is all describe a guy with the advantage killing the guy at a disadvantage.