AC Mod for 1.35 would be something along the lines of: adding the nations & certain features from AC to Cossacks BTW ( More a world @ war +30 nations & updated BTW)
CII for 1.35 would be adding certain buildings, units & certain features to cossacks BTW.( there are no new nations, except for Egypt and the later BFE 'nations' ( Restricted to 2D)
Both options are bound to the inherent limitations of the btw dmcr engine unless another engine is used.
You'r right, i didnt formulate it clear.
Hope it makes sense.