“3 IPCs for each original German, Italian, or pro-Axis neutral territory that the Soviet Union controls.” Pacific rules, P36.
It has nothing to do with which board, except that there are no German or Italian territories on the Pacific Board. The only debatable word is ORIGINAL. Not EUROPE (which isn’t in that sentence). There are also no Pro-Axis neutrals on that side, though I guess Mongolia could become Pro-Allies, never Pro-Axis.
ORIGINAL means as it is color-coded on the printed map. Regardless of if your set-up changes the INTIAL owners (say, G42), only the territories of your nation that are color-coded that way are original. Thus, Persia is never “original” even if UK controls it at the beginning of the game.