According to the Wikipedia article on demarchy:
Demarchy (or lottocracy) is a form of government in which the state is governed by randomly selected decision makers who have been selected by sortition (lot) from a broadly inclusive pool of eligible citizens.
According to the Wikipedia article on stochocracy:
Stochocracy has been proposed as an alternative form of government to representative democracy. The Iron Law of Oligarchy (see Robert Michels) asserts that democracies gradually devolve towards particracy. Stochocracy aims to reduce this decline by appointing representatives by lot instead of voting. Such a system could also be called lottocracy.
To me, they seem the same. Both use sortition to appoint representatives that take decisions. Is there any difference?