Nope, it depends on population, not only on type. Giask has max estate size of 30%, while Shinnen of 50%. Efficiency in Shinnen Purlieus for the same estate size is different than in Outer Giask. (All this regions are of Dwilight, first two are cities, second two are townslands)
Why are you comparing max estate size with min estate size? They might not follow the same rules.
