Great information Jim!!
I think it was like this. The Pumkinmold made in 1981 was used for the Pumkin in the beginning and then also the Apple. But during 1983 they made a new Hongkongmold for the Apple and the old Hongkong-pumpkin-mold was sent to Portugal. And the Hongkong-marking was blocked and Portugalmarkings were added on the back of the smurf instead.
Therefore the Apple can have both markings. A short time in the beginning when the Apple was made the old Pumkinmold was made. Then with W Berrie.
So just as you say for the red and green apple both Hongkong-Pumpkinmold with W Berrie 1981 and Apple mold with Hongkong W Berrie 1983.
For the Pumkin 2 variations of the Hongkongmold was made. First without W Berrie and then with W Berrie.
So basicly all these 3 smurfs, #1 Teacher, Green Apple and Pumpkin, can have 2 hongkong-markingvariations.