@Cesc.1987:

So if I play a single Europe 40 or Pacific 40 game I must use the setup that is on top of the faction’s boxes.
If I play a global 40 game I must use the Global 40 setup alpha 3.9 version, correct?

Not really, Alpha3.9 is way outdated, as it was the predecessor of the official Global 2nd edition ruleset.

@rulebook:

Global Rules


Set up units as shown on the setup charts found in Pacific 1940 and Europe 1940. Additionally, place the following units:
Amur: 6 Soviet Infantry
Sakha: 6 Soviet Infantry and 2 Soviet AAA
Buryatia: 6 Soviet Infantry
Egypt: 2 ANZAC Infantry (also, remove 1 United Kingdom infantry)

The powers start with the following IPC income levels and treasuries:
Power  Starting Income
Germany  30
Soviet Union  37
Japan  26
United States  52
China  12
United Kingdom - Europe  28
United Kingdom - Pacific  17
Italy  10
ANZAC  10
France  19

HTH :-)