Italy has only two unique sculpts.
Infantry - Unique Italian Sculpt (Looks kinda similar to German Infantry)
Artillery - Japanese Artillery Sculpt
Tank - Unique Italian Sculpt - (Looks kinda similar to Japanese Tank)
Fighter - German Fighter Sculpt
Bomber - Japanese Bomber Sculpt
All Navy Units are Copies of German Naval Pieces
Chinese Infantry Pieces do not look like any other infantry pieces. (If i had to chose a piece i would suggest using soviet infantry pieces)
I suggest you just buy a copy of 1942 and spray paint some of the pieces to form an Italian Army and a Chinese Army. Thats probably the cheapest solution.
Not exactly what you were looking for but I hope it helps.