Some useful charts and comparisons for the including components, between the various versions of the Axis & Allies boardgame. It is about the number of units, their capabilities and their type names. In the following link:
https://www.dropbox.com/s/0kgpp74n68fiew8/A%26A Comparisons.pdf?dl=0
Model Scales:
SOLDIERS: 1/72
TANKS: 1/285
AIRPLANES: 1/900 or larger (2cm for fighters and 4cm for bombers)
SHIPS: 1/4800 to 1/2400
(Νote that as the denominator number increases, the model becomes smaller. That is, a 1/4800 scale model is smaller than a 1/2400 scale model)