The distinction between "mountain" and "field" division in the Greek army at this time is subtle. In fact, the designations are inter-changeable, but there were two TOEs, one for a "field" and another for a "mountain" infantry division, without a change in troops. It was traditional to train all Army soldiers as "mountain" troops as well as "field" troops. In fact the Greek infantry divisions that went to the Ukraine in 1919 were first re-equipped as "field" divisions, trading equipment with the rest of the Army to do so. The Divisions serving in 1940 were all organised along "mountain" lines, hence much confusion about Greek formations.*
*
There is no cost premium for Greek mountain (ski) troops. Except in special situations the player should always purchase "mountain" troops in mountainous terrain, and "field" (regular) troops in other terrain.